Documentation: rename addr_in_gen_pool to gen_pool_has_addr

Update the document, since we have renamed addr_in_gen_pool to
gen_pool_has_addr.

Link: http://lkml.kernel.org/r/20181229015914.5573-1-sjhuang@iluvatar.ai
Signed-off-by: Huang Shijie <sjhuang@iluvatar.ai>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
1 file changed