Merge branch 'mf/format-patch-cover-letter-format' into mf/format-patch-commit-list-format

* mf/format-patch-cover-letter-format: docs: add usage for the cover-letter fmt feature format-patch: add commitListFormat config format-patch: add ability to use alt cover format format-patch: move cover letter summary generation pretty.c: add %(count) and %(total) placeholders