Merge branch 'pb/diff-doc-raw-format' into maint

Update "git diff/log --raw" format documentation. source: <pull.1259.git.1655123383.gitgitgadget@gmail.com> * pb/diff-doc-raw-format: diff-index.txt: update raw output format in examples diff-format.txt: correct misleading wording diff-format.txt: dst can be 0* SHA-1 when path is deleted, too