diff -r bd2ed1032b4e -r f38bf44e077f mercurial/upgrade_utils/engine.py
--- a/mercurial/upgrade_utils/engine.py	Tue May 04 13:28:42 2021 -0400
+++ b/mercurial/upgrade_utils/engine.py	Fri Apr 30 16:13:02 2021 -0700
@@ -134,7 +134,7 @@
     sidedatacompanion,
     oncopiedrevision,
 ):
-    """ returns the new revlog object created"""
+    """returns the new revlog object created"""
     newrl = None
     if matchrevlog(upgrade_op.revlogs_to_process, rl_type):
         ui.note(