practracker: Fix a typo in the usage message

Fixes bug 31828; bugfix on 0.4.2.1-alpha.

scripts/maint/practracker/practracker.py

@@ -181,7 +181,7 @@ def main(argv):
     parser.add_argument("--regen", action="store_true",
                         help="Regenerate the exceptions file")
     parser.add_argument("--list-overbroad", action="store_true",
-                        help="List over-strict exceptions")
+                        help="List over-broad exceptions")
     parser.add_argument("--exceptions",
                         help="Override the location for the exceptions file")
     parser.add_argument("--strict", action="store_true",