Merge branch 'jn/glossary-revision'

The wording for "revision" in the glossary wanted to say it refers to "commit (noun) as a concept" but it was badly phrased. This may need further updates to hint that in contexts where it is clear, the word may refer to an object name, not necessarily a commit. But the patch as-is is already an improvement. * jn/glossary-revision: glossary: a revision is just a commit