docs: document how to mark a candidate for a stable branch

Reviewed-by: Brian Paul <brianp@vmware.com>

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@@ -156,6 +156,22 @@ src/mesa/state_tracker/st_glsl_to_tgsi.cpp can serve as examples.
 </p>
 
 
+<h2>Marking a commit as a candidate for a stable branch</h2>
+
+<p>
+If you want a commit to be applied to a stable branch,
+you should add an appropriate note to the commit message.
+</p>
+
+<p>
+Here are some examples of such a note:
+</p>
+<ul>
+  <li>NOTE: This is a candidate for the 9.0 branch.</li>
+  <li>NOTE: This is a candidate for the 8.0 and 9.0 branches.</li>
+  <li>NOTE: This is a candidate for the stable branches.</li>
+</ul>
+
 <h2>Making a New Mesa Release</h2>
 
 <p>