ParseTemplate.cpp: Prune obsolete descriptions in ParseSingleDeclarationAfterTemplate...

ParseTemplate.cpp: Prune obsolete descriptions in ParseSingleDeclarationAfterTemplate(), for now. [-Wdocumentation]

/// \param TemplateParams if non-NULL, the template parameter lists
/// that preceded this declaration. In this case, the declaration is a
/// template declaration, out-of-line definition of a template, or an
/// explicit template specialization. When NULL, the declaration is an
/// explicit template instantiation.
///
/// \param TemplateLoc when TemplateParams is NULL, the location of
/// the 'template' keyword that indicates that we have an explicit
/// template instantiation.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@167982 91177308-0d34-0410-b5e6-96231b3b80d8