gNFS: correct some typos in comments.

Change-Id: I304c760c2318edd4bab985ca19bf9ce62fd21a3c
BUG: 1075417
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
Reviewed-on: http://review.gluster.org/8265
Reviewed-by: Santosh Pradhan <spradhan@redhat.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Tested-by: Niels de Vos <ndevos@redhat.com>