Edited wiki page DeveloperFAQ through web user interface.
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* I have an existing Adaptor that provides full data pushes - how do I make it support incremental pushes?
-The adaptor must extend `com/google/enterprise/adaptor/PollingIncrementalLister` which has a single method `getModifiedDocIds(DocIdPusher pusher)` ; when initializing the Adaptor, register with `AdaptorContext.setPollingIncrementalLister(this)`.
+Implement `com/google/enterprise/adaptor/PollingIncrementalLister` which has a single method `getModifiedDocIds(DocIdPusher pusher)` . When initializing the Adaptor, register with `AdaptorContext.setPollingIncrementalLister(yourLister)`.
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