Merge branch 'jc/maint-doc-checkout-b-always-takes-branch-name'

The synopsis said "checkout [-B branch]" to make it clear the branch name is a parameter to the option, but the heading for the option description was "-B::", not "-B branch::", making the documentation misleading. There may be room in documentation pages of other commands for similar improvements. * jc/maint-doc-checkout-b-always-takes-branch-name: doc: "git checkout -b/-B/--orphan" always takes a branch name