Martin von Zweigbergk <martinvonz@google.com> [Fri, 18 Sep 2020 10:04:02 -0700] rev 45518
rebase: fix an inconsistent hyphenation in a debug message
We used "rebasing on disk" but "rebasing in-memory". I believe the
former is correct, so I used that.
Differential Revision: https://phab.mercurial-scm.org/D9054