githelp: clean up reflog help
This referenced commands that don't exist in core. The new help
isn't great since it references an experimental extension. But
it is better than nothing.
While we're here, also add test coverage.
Differential Revision: https://phab.mercurial-scm.org/D1727
Set up
$ hg init repo
$ cd repo
Try to import an empty patch
$ hg import --no-commit - <<EOF
> EOF
applying patch from stdin
abort: stdin: no diffs found
[255]
No dirstate backups are left behind
$ ls .hg/dirstate* | sort
.hg/dirstate