Small fixes

This MR fixes a bunch of smaller issues, making the following changes:

* Template parameters in the documentation are documented with `\tparam` instead
  of `\param`
* Superfluous semicolon warnings fixed
* Fixed the type of literals used to initialize float variables

Eigen/src/CholmodSupport/CholmodSupport.h

@@ -438,7 +438,7 @@ class CholmodBase : public SparseSolverBase<Derived>
       if (m_cholmodFactor->is_ll)
         logDet *= 2.0;
       return logDet;
-    };
+    }
 
     template<typename Stream>
     void dumpMemory(Stream& /*s*/)