[ticket/11230] Use inheritdoc in docblocks in cache drivers

http://tracker.phpbb.com/browse/PHPBB3-11230

PHPBB3-11230
[ticket/11230] Update cache driver dock blocks

PHPBB3-12230
[ticket/12230] Add missing last returns to dock block

PHPBB3-12230
Merge remote-tracking branch 'vsephpbb/ticket/11230' into develop-ascraeus

* vsephpbb/ticket/11230:
  [ticket/12230] Add missing last returns to dock block
  [ticket/11230] Update cache driver dock blocks
  [ticket/11230] Use inheritdoc in docblocks in cache drivers