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Doc: fix backwards description of visibility map's all-frozen data.

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Original file line number	Diff line number	Diff line change
`@@ -630,7 +630,7 @@ can be used to examine the information stored in free space maps.`
`630`	`630`	`Each heap relation has a Visibility Map`
`631`	`631`	`(VM) to keep track of which pages contain only tuples that are known to be`
`632`	`632`	`visible to all active transactions; it also keeps track of which pages contain`
`633`		`-onlyunfrozen tuples. It's stored`
	`633`	`+onlyfrozen tuples. It's stored`
`634`	`634`	`alongside the main relation data in a separate relation fork, named after the`
`635`	`635`	`filenode number of the relation, plus a <literal>_vm</> suffix. For example,`
`636`	`636`	`if the filenode of a relation is 12345, the VM is stored in a file called`

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