LU-5710 all: second batch of corrected typos and grammar errors

Most of them are in comments, but there was a few in user
visible help.

Signed-off-by: frank zago <fzago@cray.com>
Change-Id: I32730030f84b85e0ae08b683d64bbad5e33bf0b4
Reviewed-on: http://review.whamcloud.com/12933


Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>