Documentation/vm/.gitignore: add page-types

Signed-off-by: NJosh Triplett <josh@joshtriplett.org>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Documentation/vm/.gitignore

+page-types
 slabinfo