Add deprecation rationale for p2psynch types table

Signed-off-by: David M. Ozog <[email protected]>

content/backmatter.tex

@@ -357,6 +357,8 @@ \section{Overview}\label{subsec:dep_overview}
     \minitab{\Cstd[11]: \FuncRef{shmem\_test(\CTYPE{unsigned short} ...)}
         \\ \CorCpp: \FuncRef{shmem\_ushort\_test}}
         & 1.5 & Current & (none) \\ \hline
+    \minitab{Table~\ref{p2psynctypes}: point-to-point synchronization types}
+        & 1.5 & Current & Table~\ref{stdamotypes}: standard AMO types \\ \hline
     \end{longtable}
 \end{center}
 
@@ -531,6 +533,11 @@ \subsection{\textit{C11} and \CorCpp: \FUNC{shmem\_wait\_until} and \FUNC{shmem\
 \acp{AMO} (as of \openshmem 1.5), and there is no corresponding AMO for
 \CTYPE{short} and \CTYPE{unsigned short}.
 
+\subsection{Table~\ref{p2psynctypes}: point-to-point synchronization types}
+As of \openshmem 1.5, the point-to-point synchronization routines are only
+compatible with \acp{AMO}, so their interfaces are defined via the
+standard \ac{AMO} types in Table~\ref{stdamotypes}.
+
 \chapter{Changes to this Document}\label{sec:changelog}
 
 \section{Version 1.5}