Description:
------------
There is a discrepancy in the documentation and actual behaviour of the Memcache module regarding Memcache::get().

The documentation states that the get() method supports two parameters, the second being a flag (of which only the compression flag seems listed).

It is apparent that the get() method only supports one parameter exactly, raising an e_warning.

This is a documentation update request.

Reproduce code:
---------------
php > $m = new Memcache();
php > $m->addServer('localhost', 11211);
php > echo $m->get('test', MEMCACHE_COMPRESSED);
Warning: Memcache::get() expects exactly 1 parameter, 2 given in php shell code on line 1

Expected result:
----------------
No error/warning, supplied flags passed through.

Actual result:
--------------
e_warning.