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

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