LU-6142 lustre: fix minor typos in comments

LU-6142 lustre: fix minor typos in comments

Fix minor typos in comments.

Linux-commit: d88727b ("staging: lustre: fix minor typos in comments")

Test-Parameters: trivial
Change-Id: I2232597d261c8d33d21bdfe690a5b7460bf4069d
Signed-off-by: Mr. NeilBrown <neilb@suse.de>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49274
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>