Document that submit should for granted on refs/heads/*

Change-Id: I35559de9946c205bb0af3ad1d128c8c5c86548a2
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/Documentation/access-control.txt b/Documentation/access-control.txt
index b082339..ff252f7 100644
--- a/Documentation/access-control.txt
+++ b/Documentation/access-control.txt
@@ -907,7 +907,7 @@
 * xref:category_forge_author[`Forge Author Identity`] to 'refs/heads/*'
 * link:config-labels.html#label_Code-Review[`Label: Code-Review`] with range '-2' to '+2' for 'refs/heads/*'
 * link:config-labels.html#label_Verified[`Label: Verified`] with range '-1' to '+1' for 'refs/heads/*'
-* xref:category_submit[`Submit`]
+* xref:category_submit[`Submit`] on 'refs/heads/*'
 
 If the project is small or the developers are seasoned it might make
 sense to give them the freedom to push commits directly to a branch.