Fix a few typos and a double semicolon. Patch by Eitan Adler.
diff --git a/Lib/test/test_isinstance.py b/Lib/test/test_isinstance.py
index dc2d074..7a6730e 100644
--- a/Lib/test/test_isinstance.py
+++ b/Lib/test/test_isinstance.py
@@ -15,7 +15,7 @@
# (leading to an "undetected error" in the debug build). Set up is,
# isinstance(inst, cls) where:
#
- # - cls isn't a a type, or a tuple
+ # - cls isn't a type, or a tuple
# - cls has a __bases__ attribute
# - inst has a __class__ attribute
# - inst.__class__ as no __bases__ attribute