Merge branch 'kh/bundle-docs'

Documentation for "git bundle" saw improvements to more prominently call out the use of '--all' when creating bundles. * kh/bundle-docs: Documentation/git-bundle.txt: discuss naïve backups Documentation/git-bundle.txt: mention --all in spec. refs Documentation/git-bundle.txt: remove old `--all` example Documentation/git-bundle.txt: mention full backup example