RDMA/core: Fix a couple of obvious typos in comments

Fix typos.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Link: https://lore.kernel.org/r/169643338101.8035.6826446669479247727.stgit@manet.1015granger.net


Signed-off-by: Leon Romanovsky <leon@kernel.org>