Bug 10703: Update Patron DB Documentation

Bug 10703: Update Patron DB Documentation

Update patron categories and patron restrictions DB docs.

To test:

* Review database documentation for categories
* Review database documentation for patron_debarments

Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Dobrica Pavlinusic <dpavlin@rot13.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
(cherry picked from commit 5263a9e0e926ba19bafb5ffccfa283155d621e8d)
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>