Document explicitly that wildcards match across slashes in ref names

Change-Id: Ia9dd48b5c05e3a20d398424c33dd17e1402f0769

Documentation/access-control.txt

diff --git a/Documentation/access-control.txt b/Documentation/access-control.txt
index 0123724..771e323 100644
--- a/Documentation/access-control.txt
+++ b/Documentation/access-control.txt
@@ -204,8 +204,8 @@
 Permissions can be set on a single reference name to match one
 branch (e.g. `refs/heads/master`), or on a reference namespace
 (e.g. `+refs/heads/*+`) to match any branch starting with that
-prefix. So a permission with `+refs/heads/*+` will match
-`refs/heads/master` and `refs/heads/experimental`, etc.
+prefix. So a permission with `+refs/heads/*+` will match all of
+`refs/heads/master`, `refs/heads/experimental`, `refs/heads/release/1.0` etc.
 
 Reference names can also be described with a regular expression
 by prefixing the reference name with `^`.  For example