As we transition to the new Hyland Community, some post links may be temporarily disrupted as we finalize redirects. We apologize for the inconvenience and are working to resolve this as quickly as possible. Details.
/opt/alfresco-4.0.c/tomcat/webapps/alfresco/WEB-INF/classes/alfresco/subsystems/googledocs/default/googledocs.properties
If you look at the top of the documentation page for Google Docs you'll see an "Enterprise Only" indicator.
That's because the Google Docs admin console item depends on JMX and JMX isn't included with Alfresco Community so those particular instructions only apply to Enterprise Edition.