Fix spelling mistake in access control documentation

Change-Id: Ib65fd0e960445f7dd46e399a5eb48c1a6cdde1af
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/Documentation/access-control.txt b/Documentation/access-control.txt
index 013c3eb..0cb5c46 100644
--- a/Documentation/access-control.txt
+++ b/Documentation/access-control.txt
@@ -873,7 +873,7 @@
 deliver different results (build error vs unstable for instance) it's also
 possible to set `Code-review` +1 as well.
 
-If pushing new changes are granted, it's possible to automate cherry-pick of
+If pushing new changes is granted, it's possible to automate cherry-pick of
 submitted changes for upload to other branches under certain conditions.  This
 is probably not the first step of what a project wants to automate however,
 and so the push right can be found under the optional section.