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Mention that VACUUM FREEZE also effectively zeroes the table freeze age.

Maciek Sakrejda, reviewed by Amit Kapila

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Original file line number	Diff line number	Diff line change
`@@ -101,7 +101,8 @@ VACUUM [ FULL ] [ FREEZE ] [ VERBOSE ] ANALYZE [ <replaceable class="PARAMETER">`
`101`	`101`	`Selects aggressive <quote>freezing</quote> of tuples.`
`102`	`102`	`Specifying <literal>FREEZE</literal> is equivalent to performing`
`103`	`103`	`<command>VACUUM</command> with the`
`104`		`- <xref linkend="guc-vacuum-freeze-min-age"> parameter`
	`104`	`+ <xref linkend="guc-vacuum-freeze-min-age"> and`
	`105`	`+ <xref linkend="guc-vacuum-freeze-table-age"> parameters`
`105`	`106`	`set to zero. Aggressive freezing is always performed when the`
`106`	`107`	`table is rewritten, so this option is redundant when <literal>FULL</>`
`107`	`108`	`is specified.`

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