Fixed issue: Fixed PHPDoc
Fixed issue: Memcache driver fixes

- Cleanup PHPDoc
- Removed deprecated parameter timeout

This deprecated parameter is not supported, and defaults to 0 seconds.
Do not use this parameter. It's not recommended to use the timeout parameter.
The behavior differs between memcached versions, but setting to 0 is safe.
Other values for this deprecated feature may cause the memcache delete to fail.