Add disclaimer for access control documentation

The access control documentation is outdated and describes still the
state of how the access rights configuration worked in Gerrit 2.1.8
and before. The changes to the access rights configuration that have
been done in Gerrit 2.2.x are not reflected in the documentation.
Since many users are confused by the mismatch between the
documentation and the actual Gerrit behaviour, this change adds a
disclaimer to the documentation saying that the documentation is not
up to date so that the readers at least know what to expect from it.

Change-Id: I641653b0cacc62e836db1b7a630a757d5a440a71
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
1 file changed