#18466: fix more typos.  Patch by FĂ©vry Thibault.
diff --git a/Include/datetime.h b/Include/datetime.h
index 41e3bcf..06cbc4a 100644
--- a/Include/datetime.h
+++ b/Include/datetime.h
@@ -42,7 +42,7 @@
 
 typedef struct
 {
-    PyObject_HEAD               /* a pure abstract base clase */
+    PyObject_HEAD               /* a pure abstract base class */
 } PyDateTime_TZInfo;