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Correct TABLESAMPLE docs

Revert to original use of word “sample”, though with clarification,per Tom Lane.Discussion: 29052.1471015383@sss.pgh.pa.us

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Original file line number	Diff line number	Diff line change
`@@ -391,7 +391,7 @@ TABLE [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ]`
`391`	`391`	`not been changed meanwhile. But different seed values will usually`
`392`	`392`	`produce different samples.`
`393`	`393`	`If <literal>REPEATABLE</literal> is not given then a new random`
`394`		`-seed is selected for each query.`
	`394`	`+sample is selected for each query, based upon a system-generated seed.`
`395`	`395`	`Note that some add-on sampling methods do not`
`396`	`396`	`accept <literal>REPEATABLE</literal>, and will always produce new`
`397`	`397`	`samples on each use.`

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