LU-9462 doc: update lfs setstripe man page and usage

LU-9462 doc: update lfs setstripe man page and usage

Update the lfs-setstripe.1 man page formatting and content.
Update the "lfs setstripe" usage message to be in "common use" order.

Test-Parameters: trivial
Reviewed-on: https://review.whamcloud.com/27066
Lustre-change-by: Andreas Dilger <andreas.dilger@intel.com>
Lustre-commit: aa83ef5a9ec470d2f6af07d47b3dd763f4a0e7ce

Signed-off-by: Steve Guminski <stephenx.guminski@intel.com>
Change-Id: Ia761c7562fa398a8c1bb4354d09757cd5f3ebbe5
Reviewed-by: Jian Yu <jian.yu@intel.com>
Signed-off-by: Minh Diep <minh.diep@intel.com>
Reviewed-on: https://review.whamcloud.com/29627
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>