rebase: mention -r argument in synopsis
I'm guessing that we simply forgot to mention it there. I was
wondering if maybe `-r` was experimental as long as evolution is, but
that doesn't seem to be the case (`-r` is not marked experimental).
Differential Revision: https://phab.mercurial-scm.org/D8295
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true