Fix all the doxygen warnings.

Eigen/src/Core/NumTraits.h

@@ -115,6 +115,7 @@ EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC Tgt bit_cast(const Src& src) {
 }
 }  // namespace numext
 
+// clang-format off
 /** \class NumTraits
  * \ingroup Core_Module
  *
@@ -126,48 +127,50 @@ EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC Tgt bit_cast(const Src& src) {
  *
  * The provided data consists of:
  * \li A typedef \c Real, giving the "real part" type of \a T. If \a T is already real,
- *     then \c Real is just a typedef to \a T. If \a T is \c std::complex<U> then \c Real
+ *     then \c Real is just a typedef to \a T. If \a T is `std::complex<U>` then \c Real
  *     is a typedef to \a U.
  * \li A typedef \c NonInteger, giving the type that should be used for operations producing non-integral values,
  *     such as quotients, square roots, etc. If \a T is a floating-point type, then this typedef just gives
  *     \a T again. Note however that many Eigen functions such as internal::sqrt simply refuse to
  *     take integers. Outside of a few cases, Eigen doesn't do automatic type promotion. Thus, this typedef is
  *     only intended as a helper for code that needs to explicitly promote types.
- * \li A typedef \c Literal giving the type to use for numeric literals such as "2" or "0.5". For instance, for \c
- * std::complex<U>, Literal is defined as \c U. Of course, this type must be fully compatible with \a T. In doubt, just
- * use \a T here. \li A typedef \a Nested giving the type to use to nest a value inside of the expression tree. If you
- * don't know what this means, just use \a T here. \li An enum value \a IsComplex. It is equal to 1 if \a T is a \c
- * std::complex type, and to 0 otherwise. \li An enum value \a IsInteger. It is equal to \c 1 if \a T is an integer type
- * such as \c int, and to \c 0 otherwise. \li Enum values ReadCost, AddCost and MulCost representing a rough estimate of
- * the number of CPU cycles needed to by move / add / mul instructions respectively, assuming the data is already stored
- * in CPU registers. Stay vague here. No need to do architecture-specific stuff. If you don't know what this means, just
- * use \c Eigen::HugeCost. \li An enum value \a IsSigned. It is equal to \c 1 if \a T is a signed type and to 0 if \a T
- * is unsigned. \li An enum value \a RequireInitialization. It is equal to \c 1 if the constructor of the numeric type
- * \a T must be called, and to 0 if it is safe not to call it. Default is 0 if \a T is an arithmetic type, and 1
- * otherwise. \li An epsilon() function which, unlike <a
- * href="http://en.cppreference.com/w/cpp/types/numeric_limits/epsilon">std::numeric_limits::epsilon()</a>, it returns a
- * \a Real instead of a \a T. \li A dummy_precision() function returning a weak epsilon value. It is mainly used as a
- * default value by the fuzzy comparison operators. \li highest() and lowest() functions returning the highest and
- * lowest possible values respectively. \li digits() function returning the number of radix digits (non-sign digits for
- * integers, mantissa for floating-point). This is the analogue of <a
- * href="http://en.cppreference.com/w/cpp/types/numeric_limits/digits">std::numeric_limits<T>::digits</a> which is used
- * as the default implementation if specialized. \li digits10() function returning the number of decimal digits that can
- * be represented without change. This is the analogue of <a
- * href="http://en.cppreference.com/w/cpp/types/numeric_limits/digits10">std::numeric_limits<T>::digits10</a> which is
- * used as the default implementation if specialized. \li max_digits10() function returning the number of decimal digits
- * required to uniquely represent all distinct values of the type. This is the analogue of <a
- * href="http://en.cppreference.com/w/cpp/types/numeric_limits/max_digits10">std::numeric_limits<T>::max_digits10</a>
+ * \li A typedef \c Literal giving the type to use for numeric literals such as "2" or "0.5". For instance, for
+ *     `std::complex<U>`, Literal is defined as \a U. Of course, this type must be fully compatible with \a T. In doubt,
+ *     just use \a T here.
+ * \li A typedef \c Nested giving the type to use to nest a value inside of the expression tree. If you don't know what
+ *     this means, just use \a T here.
+ * \li An enum value \c IsComplex. It is equal to 1 if \a T is a \c std::complex type, and to 0 otherwise.
+ * \li An enum value \c IsInteger. It is equal to \c 1 if \a T is an integer type such as \c int, and to \c 0 otherwise.
+ * \li Enum values \c ReadCost, \c AddCost and \c MulCost representing a rough estimate of the number of CPU cycles needed to by
+ *     move / add / mul instructions respectively, assuming the data is already stored in CPU registers. Stay vague here.
+ *     No need to do architecture-specific stuff. If you don't know what this means, just use \c Eigen::HugeCost.
+ * \li An enum value \c IsSigned. It is equal to \c 1 if \a T is a signed type and to 0 if \a T is unsigned.
+ * \li An enum value \c RequireInitialization. It is equal to \c 1 if the constructor of the numeric type \a T must be
+ *     called, and to 0 if it is safe not to call it. Default is 0 if \a T is an arithmetic type, and 1 otherwise.
+ * \li An epsilon() function which, unlike <a href="http://en.cppreference.com/w/cpp/types/numeric_limits/epsilon">
+ *     `std::numeric_limits::epsilon()`</a>, it returns a \c Real instead of a \a T.
+ * \li A dummy_precision() function returning a weak epsilon value. It is mainly used as a default value by the fuzzy
+ *     comparison operators.
+ * \li highest() and lowest() functions returning the highest and lowest possible values respectively.
+ * \li digits() function returning the number of radix digits (non-sign digits for integers, mantissa for floating-point).
+ *     This is the analogue of <a href="http://en.cppreference.com/w/cpp/types/numeric_limits/digits">
+ *     `std::numeric_limits<T>::digits`</a> which is used as the default implementation if specialized.
+ * \li digits10() function returning the number of decimal digits that can be represented without change. This is the
+ *     analogue of <a href="http://en.cppreference.com/w/cpp/types/numeric_limits/digits10">
+ *     `std::numeric_limits<T>::digits10`</a> which is used as the default implementation if specialized.
+ * \li max_digits10() function returning the number of decimal digits required to uniquely represent all distinct values
+ *     of the type. This is the analogue of <a
+ *     href="http://en.cppreference.com/w/cpp/types/numeric_limits/max_digits10">`std::numeric_limits<T>::max_digits10`</a>
  *     which is used as the default implementation if specialized.
  * \li min_exponent() and max_exponent() functions returning the highest and lowest possible values, respectively,
  *     such that the radix raised to the power exponent-1 is a normalized floating-point number.  These are equivalent
- * to <a
- * href="http://en.cppreference.com/w/cpp/types/numeric_limits/min_exponent">std::numeric_limits<T>::min_exponent</a>/
- *     <a
- * href="http://en.cppreference.com/w/cpp/types/numeric_limits/max_exponent">std::numeric_limits<T>::max_exponent</a>.
+ *     to <a href="http://en.cppreference.com/w/cpp/types/numeric_limits/min_exponent">
+ *     `std::numeric_limits<T>::min_exponent`</a>/<a
+ *     href="http://en.cppreference.com/w/cpp/types/numeric_limits/max_exponent">`std::numeric_limits<T>::max_exponent`</a>.
  * \li infinity() function returning a representation of positive infinity, if available.
- * \li quiet_NaN function returning a non-signaling "not-a-number", if available.
+ * \li quiet_NaN() function returning a non-signaling "not-a-number", if available.
  */
-
+// clang-format on
 template <typename T>
 struct GenericNumTraits {
   enum {