docs/man: make git-lfs-migrate(1) migrate single branch instead of whole repo
docs/man: make git-lfs-migrate(1) migrate single branch instead of whole repo

Jericho25/-git-lfs_miilkyway,aleb/git-lfs,dakotahawkins/git-lfs,github/git-lfs,aleb/git-lfs,github/git-lfs,Jericho25/-git-lfs_miilkyway,dakotahawkins/git-lfs,dakotahawkins/git-lfs,github/git-lfs,Jericho25/-git-lfs_miilkyway,aleb/git-lfs