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Docs: fix pg_wal_lsn_diff manual.

The manual did not mention whether its return value is (first arg -second arg) or (second arg - first arg). The order matters because thereturn value could have a sign. Fix the manual so that it mentions thefunction returns (first arg - second arg).Patch reviewed by Tom Lane.Back-patch through v13. Older version's doc format is difficult to addmore description.Discussion:https://postgr.es/m/flat/20210206.151125.960423226279810864.t-ishii%40sraoss.co.jp

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doc/src/sgml
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`‎doc/src/sgml/func.sgml`

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -24403,11 +24403,11 @@ SELECT collation for ('foo' COLLATE "de_DE");`
`24403`	`24403`	`<indexterm>`
`24404`	`24404`	`<primary>pg_wal_lsn_diff</primary>`
`24405`	`24405`	`</indexterm>`
`24406`		`- <function>pg_wal_lsn_diff</function> ( <parameter>lsn</parameter> <type>pg_lsn</type>, <parameter>lsn</parameter> <type>pg_lsn</type> )`
	`24406`	`+ <function>pg_wal_lsn_diff</function> ( <parameter>lsn1</parameter> <type>pg_lsn</type>, <parameter>lsn2</parameter> <type>pg_lsn</type> )`
`24407`	`24407`	`<returnvalue>numeric</returnvalue>`
`24408`	`24408`	`</para>`
`24409`	`24409`	`<para>`
`24410`		`- Calculates the difference in bytes between two write-ahead log`
	`24410`	`+ Calculates the difference in bytes(<parameter>lsn1</parameter> - <parameter>lsn2</parameter>)between two write-ahead log`
`24411`	`24411`	`locations. This can be used`
`24412`	`24412`	`with <structname>pg_stat_replication</structname> or some of the`
`24413`	`24413`	`functions shown in <xref linkend="functions-admin-backup-table"/> to`

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Commit9c89c4b

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`‎doc/src/sgml/func.sgml`

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