[func.wrap.func.general, func.wrap.move.class] Remove redundant declaration (#6273)

We don't need to repeat the declarations of the incomplete primary
template, they are already present in the <functional> synopsis.

Author: jwakely

source/utilities.tex

@@ -12808,8 +12808,6 @@
 \indexlibrarymember{result_type}{function}%
 \begin{codeblock}
 namespace std {
-  template<class> class function;       // \notdef
-
   template<class R, class... ArgTypes>
   class function<R(ArgTypes...)> {
   public:
@@ -13281,8 +13279,6 @@
 \indexlibraryglobal{move_only_function}%
 \begin{codeblock}
 namespace std {
-  template<class... S> class move_only_function;                // \notdef
-
   template<class R, class... ArgTypes>
   class move_only_function<R(ArgTypes...) @\cv{}@ @\placeholder{ref}@ noexcept(@\placeholder{noex}@)> {
   public: