Add some explanaiton in the example about the content_preview field
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@ -6,6 +6,9 @@ class Query_Headlines extends Plugin {
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// - the array of elements that are returned by queryFeedHeadlines
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// - the length that the caller wants to truncate the content preview to
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// - a boolean that indicates if the caller is from an API call
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// The field content_preview has been shortened and sanitized, as appropriate
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// before the plugin is called. If you want to do your own preview handling
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// use the content field and create the preview from that
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//NOTE:**** You have to make this a system plugin if you want it to also work
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// on API calls. If you just make it a user plugin it will work on web page output
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// but not on API calls
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