Fix up all doxygen warnings.

unsupported/Eigen/CXX11/src/Tensor/TensorSyclPlaceHolderExpr.h

@@ -36,7 +36,7 @@ struct PlaceHolder {
   typedef Scalar Type;
 };
 
-/// \sttruct PlaceHolderExpression
+/// \struct PlaceHolderExpression
 /// \brief it is used to create the PlaceHolder expression. The PlaceHolder
 /// expression is a copy of expression type in which the TensorMap of the has
 /// been replaced with PlaceHolder.

unsupported/Eigen/CXX11/src/TensorSymmetry/Symmetry.h

@@ -71,7 +71,7 @@ struct AntiHermiticity
 };
 
 /** \class DynamicSGroup
-  * \ingroup TensorSymmetry_Module
+  * \ingroup CXX11_TensorSymmetry_Module
   *
   * \brief Dynamic symmetry group
   *
@@ -88,7 +88,7 @@ class DynamicSGroup;
 /** \internal
   *
   * \class DynamicSGroupFromTemplateArgs
-  * \ingroup TensorSymmetry_Module
+  * \ingroup CXX11_TensorSymmetry_Module
   *
   * \brief Dynamic symmetry group, initialized from template arguments
   *
@@ -99,7 +99,7 @@ template<typename... Gen>
 class DynamicSGroupFromTemplateArgs;
 
 /** \class StaticSGroup
-  * \ingroup TensorSymmetry_Module
+  * \ingroup CXX11_TensorSymmetry_Module
   *
   * \brief Static symmetry group
   *
@@ -121,7 +121,7 @@ template<typename... Gen>
 class StaticSGroup;
 
 /** \class SGroup
-  * \ingroup TensorSymmetry_Module
+  * \ingroup CXX11_TensorSymmetry_Module
   *
   * \brief Symmetry group, initialized from template arguments
   *
@@ -179,7 +179,7 @@ template<int One_, int Two_, typename... Sym> struct tensor_symmetry_num_indices
 /** \internal
   *
   * \class tensor_symmetry_pre_analysis
-  * \ingroup TensorSymmetry_Module
+  * \ingroup CXX11_TensorSymmetry_Module
   *
   * \brief Pre-select whether to use a static or dynamic symmetry group
   *

unsupported/Eigen/CXX11/src/util/MaxSizeVector.h

@@ -13,7 +13,7 @@
 namespace Eigen {
 
 /** \class MaxSizeVector
-  * \ingroup Core
+  * \ingroup Core_Module
   *
   * \brief The MaxSizeVector class.
   *