[exec.split] Add \exposid for local-state (cplusplus#7224)

Author: hewillk

source/exec.tex

@@ -3982,7 +3982,7 @@
 that has a function call operator equivalent to the following:
 \begin{codeblock}
 template<class Sndr, class Rcvr>
-void operator()(local-state<Sndr, Rcvr>& state, Rcvr& rcvr) const noexcept;
+void operator()(@\exposid{local-state}@<Sndr, Rcvr>& state, Rcvr& rcvr) const noexcept;
 \end{codeblock}
 
 \effects