[release] mention non-contributor status

doc/release/validation.tex

@@ -121,6 +121,11 @@ sed -n 's/^author //p' | sort -f | uniq -ic | sort -nr
 \textbf{Note:} This requires to install the package \texttt{parallel}. Source
 for the command: \url{https://gist.github.com/amitchhajer/4461043}.
 
+\textbf{Note:} For various reasons, people who contributed more than 100 LoC in
+a release might not be cited as contributor. Check
+\url{https://git.frama-c.com/frama-c/frama-c/-/wikis/Non-contributors} to see
+if this is the case before adding someone (and edit the wiki if needed).
+
 \subsection{Commit}
 
 Commit any change that you have done during these checks \textbf{and push}.