Fix small text mistake in tests

Author: johnslavik

Lib/test/test_exceptions.py

@@ -2082,7 +2082,7 @@ def bare_raise(name):
             raise AttributeError
         mod2.__getattr__ = bare_raise
 
-        mod3 = ModuleType("bareraise")
+        mod3 = ModuleType("custom")
         def raise_custom(name):
             raise AttributeError("custom")
         mod3.__getattr__ = raise_custom