[unord.map.overview] Remove stray template-head on non-template

Author: jwakely

source/containers.tex

@@ -11496,7 +11496,6 @@
       iterator       find(const K& k);
     template<class K>
       const_iterator find(const K& k) const;
-    template<class K>
     size_type        count(const key_type& k) const;
     template<class K>
       size_type      count(const K& k) const;