[core-workflow] What instructions to give for squashing PRs from the CLI?

[Brett Cannon]

While we will use GitHub's Squash and Merge button for PRs, that doesn't
meant everyone will want to use it; some people just prefer using a CLI.
That means we need to come up with a set of instructions on how to take a
GitHub PR and perform a squash commit manually at the CLI (committing a
patch from bugs.python.org is simply since there's no squashing to do).
Anyone have that set of commands handy?
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