scripts: gerrit: Grammar/spelling fixes.

Just a few minor grammar/spelling fixes while I was in there.

BUG=b:223433932
TEST=None

Change-Id: Idaf1e1d127df1afca42f375c4d54cf9e56bae703
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3668771
Auto-Submit: Alex Klein <saklein@chromium.org>
Reviewed-by: Gilberto Contreras <gcontreras@google.com>
Tested-by: Alex Klein <saklein@chromium.org>
Commit-Queue: Gilberto Contreras <gcontreras@google.com>
diff --git a/scripts/gerrit.py b/scripts/gerrit.py
index b00d719..f709018 100644
--- a/scripts/gerrit.py
+++ b/scripts/gerrit.py
@@ -458,7 +458,7 @@
       # when CQ-DEPEND uses a Gerrit Change-Id, but that Change-Id shows up
       # across multiple repos/branches.  We blindly check all of them in the
       # hopes that all open ones are what the user wants, but then again the
-      # CQ-DEPEND syntax itself is unable to differeniate.  *shrug*
+      # CQ-DEPEND syntax itself is unable to differentiate.  *shrug*
       if len(changes) > 1:
         logging.warning('CL %s has an ambiguous CQ dependency %s',
                         cl, dep.ToGerritQueryText())
@@ -519,7 +519,7 @@
   @classmethod
   def __call__(cls, opts):
     """Implement the action."""
-    # Convert user friendly command line option into a gerrit parameter.
+    # Convert user-friendly command line option into a gerrit parameter.
     def task(arg):
       helper, cl = GetGerrit(opts, arg)
       helper.SetReview(cl, labels={cls.LABEL: opts.value[0]}, msg=opts.msg,
@@ -867,7 +867,7 @@
 
 
 class ActionCherryPick(UserAction):
-  """Cherry pick CLs to branches."""
+  """Cherry-pick CLs to branches."""
 
   COMMAND = 'cherry-pick'