docs: stable-kernel-rules: create special tag to flag 'no backporting'

Document a new variant of the stable tag developers can use to make the
stable team's tools ignore a change[1].

That way developers can use 'Fixes:' tags without fearing the changes
might be backported in semi-automatic fashion. Such concerns are the
reason why some developers deliberately omit the 'Fixes:' tag in
changes[2] -- which somewhat undermines the reason for the existence of
that tag and might be unwise in the long term[3].

Link: https://lore.kernel.org/all/[email protected]/ [1]
Link: https://lore.kernel.org/all/[email protected]/ [2]
Link: https://lore.kernel.org/all/[email protected]/ [3]
Signed-off-by: Thorsten Leemhuis <[email protected]>
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
Link: https://lore.kernel.org/r/35989d3b2f3f8cf23828b0c84fde9b17a74be97c.1714367921.git.linux@leemhuis.info

Author: knurd

Documentation/process/stable-kernel-rules.rst

@@ -129,6 +129,12 @@ comment to pass arbitrary or predefined notes:
 
     Cc: <[email protected]> # see patch description, needs adjustments for <= 6.3
 
+There furthermore is a variant of the stable tag you can use to make the stable
+team's backporting tools (e.g AUTOSEL or scripts that look for commits
+containing a 'Fixes:' tag) ignore a change::
+
+     Cc: <[email protected]> # reason goes here, and must be present
+
 .. _option_2:
 
 Option 2