Fix typos, add Minimal in external plugin list

doc/release/branch.tex

@@ -82,7 +82,7 @@ On the new \texttt{stable} branch, execute the script:
 
 This will:
 \begin{itemize}
-  \item update the \texttt{Changelog}
+  \item update the \texttt{Changelog}s
   \item update the changes in the manuals \textbf{(excluding ACSL and E-ACSL references)}
   \item update the \texttt{VERSION} and \texttt{VERSION\_CODENAME} files
   \item update the \texttt{opam} files (Frama-C, lint, hdrck)
@@ -119,6 +119,7 @@ List of external plugins repo names:
   \item frama-clang
   \item GenAssigns
   \item Meta
+  \item Minimal
   \item Mthread
   \item PathCrawler
   \item Security