Access control documentation: Fixing some errors

It seems the documentation falsely stated that you need to set permissions
for 'refs/changes/*'. So that reference is removed.
Also, some example permissions missed which reference to set them to.

Bug: issue 1602
Change-Id: Ie56a68f5f58d13671d7b7d2eaeca2132e4e61a1d
Signed-off-by: Fredrik Luthander <fredrik.luthander@sonymobile.com>
1 file changed