access-control.txt: Fix ref on which Forge Committer must be assigned

The Forge Committer access right needs to be assigned on refs/heads/...,
not on refs/for...

Release-Notes: skip
Change-Id: I7a87e5a54c3e45f59669a9cfbf6ed3e0944045d5
Signed-off-by: Edwin Kempin <ekempin@google.com>
(cherry picked from commit 0d72feb7a2f9414082ca18323b32196683797be8)
diff --git a/Documentation/access-control.txt b/Documentation/access-control.txt
index 67e4573..19a19dd 100644
--- a/Documentation/access-control.txt
+++ b/Documentation/access-control.txt
@@ -1090,7 +1090,7 @@
 * <<examples_developer,Developer rights>>
 * <<category_push,`Push`>> to 'refs/heads/*'
 * <<category_push_merge,`Push merge commit`>> to 'refs/heads/*'
-* <<category_forge_committer,`Forge Committer Identity`>> to 'refs/for/refs/heads/*'
+* <<category_forge_committer,`Forge Committer Identity`>> to 'refs/heads/*'
 * <<category_create,`Create Reference`>> to 'refs/heads/*'
 * <<category_create_annotated,`Create Annotated Tag`>> to 'refs/tags/*'