[wwwdocs,committed] git.html: Move OG12 to OG13, briefly mention old branches

[wwwdocs,committed] git.html: Move OG12 to OG13, briefly mention old branches

[Tobias Burnus]

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Committed as  6196747803d192744097590d6703a94def0030f4 →
https://gcc.gnu.org/git.html

Tobias
-----------------
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commit 6196747803d192744097590d6703a94def0030f4
Author: Tobias Burnus <tobias@codesourcery.com>
Date:   Mon May 22 10:08:14 2023 +0200

    git.html: Move OG12 to OG13, briefly mention old branches

diff --git a/htdocs/git.html b/htdocs/git.html
index 701773ef..22c0eec1 100644
--- a/htdocs/git.html
+++ b/htdocs/git.html
@@ -280,16 +280,17 @@ in Git.</p>
   Makarov <a href="mailto:vmakarov@redhat.com">vmakarov@redhat.com</a>.
   </dd>
 
-  <dt><a href="https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;a=shortlog;h=refs/heads/devel/omp/gcc-12">devel/omp/gcc-12</a></dt>
+  <dt><a href="https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;a=shortlog;h=refs/heads/devel/omp/gcc-13">devel/omp/gcc-13</a></dt>
   <dd>This branch is for collaborative development of
   <a href="https://gcc.gnu.org/wiki/OpenACC">OpenACC</a> and
   <a href="https://gcc.gnu.org/wiki/openmp">OpenMP</a> support and related
   functionality, such
   as <a href="https://gcc.gnu.org/wiki/Offloading">offloading</a> support (OMP:
   offloading and multi processing).
-  The branch is based on releases/gcc-12.
-  Please send patch emails with a short-hand <code>[og12]</code> tag in the
-  subject line, and use <code>ChangeLog.omp</code> files.</dd>
+  The branch is based on releases/gcc-13.
+  Please send patch emails with a short-hand <code>[og13]</code> tag in the
+  subject line, and use <code>ChangeLog.omp</code> files. (Likewise but now
+  stale branches exists for the prior GCC releases 9 to 12.)</dd>
 
   <dt>unified-autovect</dt>
   <dd>This branch is for work on improving effectiveness and generality of GCC's