fix grammar typo in logging.rst (#136584)

Author: wjandrea

Doc/library/logging.rst

@@ -1317,7 +1317,7 @@ functions.
       In Python versions earlier than 3.4, this function could also be passed a
       text level, and would return the corresponding numeric value of the level.
       This undocumented behaviour was considered a mistake, and was removed in
-      Python 3.4, but reinstated in 3.4.2 due to retain backward compatibility.
+      Python 3.4, but reinstated in 3.4.2 in order to retain backward compatibility.
 
 .. function:: getHandlerByName(name)