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pg_buffercache: document column meanings

Improve documentation for usagecount and relforknumber.Backpatch to 9.3Suggestion from Satoshi Nagayasu

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Lines changed: 3 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -84,7 +84,8 @@`
`84`	`84`	`<entry><structfield>relforknumber</structfield></entry>`
`85`	`85`	`<entry><type>smallint</type></entry>`
`86`	`86`	`<entry></entry>`
`87`		`- <entry>Fork number within the relation</entry>`
	`87`	`+ <entry>Fork number within the relation; see`
	`88`	`+ <filename>include/storage/relfilenode.h</></entry>`
`88`	`89`	`</row>`
`89`	`90`
`90`	`91`	`<row>`
`@@ -98,7 +99,7 @@`
`98`	`99`	`<entry><structfield>usagecount</structfield></entry>`
`99`	`100`	`<entry><type>smallint</type></entry>`
`100`	`101`	`<entry></entry>`
`101`		`- <entry>Page LRU count</entry>`
	`102`	`+ <entry>Clock-sweep access count</entry>`
`102`	`103`	`</row>`
`103`	`104`
`104`	`105`	`</tbody>`

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