the word "extension" has been banned from ZConfig; don't use it

doc/ZConfig/zconfig.tex

@@ -231,7 +231,7 @@ application.  Here is an example logging configuration:
 </eventlog>
 \end{verbatim}
 
-A third-party extension may provide a log handler to send
+A third-party component may provide a log handler to send
 high-priority alerts the system administrator's text pager or
 SMS-capable phone.  All that's needed is to install the implementation
 so it can be imported by Python, and modify the configuration: