Comment fixes extracted from patch by Demur Rumed.
diff --git a/Objects/abstract.c b/Objects/abstract.c
index 12dd6a1..8ca6933 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -2132,7 +2132,7 @@
                              "%s returned NULL without setting an error",
                              where);
 #ifdef Py_DEBUG
-            /* Ensure that the bug is catched in debug mode */
+            /* Ensure that the bug is caught in debug mode */
             Py_FatalError("a function returned NULL without setting an error");
 #endif
             return NULL;