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doc: clarify handling of ts_headline() operators & extra words

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Original file line number	Diff line number	Diff line change
`@@ -1287,7 +1287,10 @@ ts_headline(<optional> <replaceable class="parameter">config</replaceable> <type`
`1287`	`1287`	`<para>`
`1288`	`1288`	`<function>ts_headline</function> accepts a document along`
`1289`	`1289`	`with a query, and returns an excerpt from`
`1290`		`- the document in which terms from the query are highlighted. The`
	`1290`	`+ the document in which terms from the query are highlighted.`
	`1291`	`+ Specifically, the function will use the query to select relevant`
	`1292`	`+ text fragments, and then highlight all words that appear in the query,`
	`1293`	`+ even if those word positions do not match the query's restrictions. The`
`1291`	`1294`	`configuration to be used to parse the document can be specified by`
`1292`	`1295`	`<replaceable>config</replaceable>; if <replaceable>config</replaceable>`
`1293`	`1296`	`is omitted, the`

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