[flat.map.modifiers] Fix erroneous "try_emplace_hint" (#6238)

The hint-taking operation is instead an overload of try_emplace.

Author: Quuxplusone

source/containers.tex

@@ -15623,7 +15623,7 @@
 \end{codeblock}
 for the first two overloads or
 \begin{codeblock}
-try_emplace_hint(hint, std::forward<decltype(k)>(k), std::forward<M>(obj))
+try_emplace(hint, std::forward<decltype(k)>(k), std::forward<M>(obj))
 \end{codeblock}
 for the last two overloads.
 
@@ -15674,11 +15674,11 @@
 assigns \tcode{std::forward<\linebreak M>(obj)} to \tcode{e.second}.
 Otherwise, equivalent to
 \begin{codeblock}
-try_emplace(std::forward<decltype(k)>(k), std::forward<M>(obj))
+try_emplace(std::forward<K>(k), std::forward<M>(obj))
 \end{codeblock}
 for the first overload or
 \begin{codeblock}
-try_emplace_hint(hint, std::forward<decltype(k)>(k), std::forward<M>(obj))
+try_emplace(hint, std::forward<K>(k), std::forward<M>(obj))
 \end{codeblock}
 for the second overload.