Access control documentation: Final cleanup

* Removing the disclaimer for outdated documentation.
* Add links between different sections, where referred.
* Fixed examples where Exclusive flag isn't a prefixing '-' on branch
references anymore, but instead it's own tick box.
* Removes mention of previously reserved words in the category_id
table.

Change-Id: Ifccd40c8fe12c570618701c36aa3d1c0ab1705d4
Signed-off-by: Fredrik Luthander <fredrik.luthander@sonyericsson.com>