Martin von Zweigbergk <martinvonz@google.com> [Tue, 12 Oct 2021 14:12:41 -0700] rev 48215
chistedit: rename a confusingly named variable
I would expect `ctxs` contain instances of some class from the
`context` module but it actually contains instances of `histeditrule`.
Differential Revision: https://phab.mercurial-scm.org/D11653