LU-930 doc: fix formatting errors in lfs_migrate.1

LU-930 doc: fix formatting errors in lfs_migrate.1

Add missing .TP sections for the command-line options.
Remove duplicate EXAMPLES section and '--yes' from bad merge.

Test-Parameters: trivial
Fixes: 99d7a8ed43b ("LU-8207 scripts: add auto-stripe option to lfs_migrate")
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I5de290e00c5fd718e53ac0fc801d44e1cf3ebbe5
Reviewed-on: https://review.whamcloud.com/36959
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Shaun Tancheff <stancheff@cray.com>
Reviewed-by: Arshad Hussain <arshad.super@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>