Reformat comments after switch to black

Change-Id: Ic361798160bb1d50e3d79404b8cc54515b9071ed
Reviewed-on: https://pigweed-review.googlesource.com/c/infra/recipes/+/19160
Reviewed-by: Oliver Newman <olivernewman@google.com>
Commit-Queue: Rob Mohr <mohrr@google.com>
diff --git a/recipe_modules/roll_util/api.py b/recipe_modules/roll_util/api.py
index 4baea61..32d24d7 100644
--- a/recipe_modules/roll_util/api.py
+++ b/recipe_modules/roll_util/api.py
@@ -175,7 +175,7 @@
     def check_roll_direction(
         self, git_dir, old, new, name='check roll direction'
     ):
-        """Return if old is an ancestor of new (i.e., the roll moves forward)."""
+        """Return if old is an ancestor of new (i.e., a "forward" roll)."""
         if old == new:
             with self.m.step.nest(name) as pres:
                 pres.step_summary_text = 'up-to-date'
@@ -204,7 +204,10 @@
                 'than {new}'
             )
             if old_revision == new_revision:
-                fmt = 'not updating from {old} to {new} because they are identical'
+                fmt = (
+                    'not updating from {old} to {new} because they are '
+                    'identical'
+                )
             pres.step_summary_text = fmt.format(
                 old=old_revision[0:7], new=new_revision[0:7]
             )