Merge branch 'ma/commit-graph-docs' into maint

Doc update.

* ma/commit-graph-docs:
Doc: refer to the "commit-graph file" with dash
git-commit-graph.txt: refer to "*commit*-graph file"
git-commit-graph.txt: typeset more in monospace
git-commit-graph.txt: fix bullet lists

diff --cc Documentation/technical/commit-graph.txt
Simple merge