LU-5710 corrected some typos and grammar errors

LU-5710 corrected some typos and grammar errors

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

Change-Id: Ib050e9042f9f2728cd3eeedeee679739b48419db
Signed-off-by: frank zago <fzago@cray.com>
Reviewed-on: http://review.whamcloud.com/12201
Tested-by: Jenkins
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>