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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`

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Original file line number	Diff line number	Diff line change
`@@ -25102,11 +25102,11 @@ SELECT collation for ('foo' COLLATE "de_DE");`
`25102`	`25102`	`<indexterm>`
`25103`	`25103`	`<primary>pg_wal_lsn_diff</primary>`
`25104`	`25104`	`</indexterm>`
`25105`		`- <function>pg_wal_lsn_diff</function> ( <parameter>lsn</parameter> <type>pg_lsn</type>, <parameter>lsn</parameter> <type>pg_lsn</type> )`
	`25105`	`+ <function>pg_wal_lsn_diff</function> ( <parameter>lsn1</parameter> <type>pg_lsn</type>, <parameter>lsn2</parameter> <type>pg_lsn</type> )`
`25106`	`25106`	`<returnvalue>numeric</returnvalue>`
`25107`	`25107`	`</para>`
`25108`	`25108`	`<para>`
`25109`		`- Calculates the difference in bytes between two write-ahead log`
	`25109`	`+ Calculates the difference in bytes(<parameter>lsn1</parameter> - <parameter>lsn2</parameter>)between two write-ahead log`
`25110`	`25110`	`locations. This can be used`
`25111`	`25111`	`with <structname>pg_stat_replication</structname> or some of the`
`25112`	`25112`	`functions shown in <xref linkend="functions-admin-backup-table"/> to`

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Commit04fd3ee

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`‎doc/src/sgml/func.sgml`

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