Typo in comment

Author: RKrahl

tests/test_09_examples_debugging.py

@@ -9,7 +9,7 @@ def test_debugging(ctestdir):
     """Debugging example
     """
     # The debugging example requires the enum module which is has been
-    # added to the standard kibrary in Python 3.4.  Skip this test if
+    # added to the standard library in Python 3.4.  Skip this test if
     # the module is not available.
     _ = pytest.importorskip("enum")
     with get_example("debugging.py").open("rt") as f: