Documentation: Add Arnaldo Melo to list of enforcement statement endorsers

Add my name to the list.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Documentation/process/kernel-enforcement-statement.rst

@@ -118,6 +118,7 @@ we might work for today, have in the past, or will in the future.
   - Mike Marshall
   - Chris Mason
   - Paul E. McKenney
+  - Arnaldo Carvalho de Melo
   - David S. Miller
   - Ingo Molnar
   - Kuninori Morimoto