rust: Fix outdated comments in OwningDirstateMap...
rust: Fix outdated comments in OwningDirstateMap
OwningDirstateMap used to own a PyBytes, but was generalized to be
more generic when it was moved from hg-cpython to hg-core.
This fixes some comments that were still referencing PyBytes.
Differential Revision:
https://phab.mercurial-scm.org/D12003