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Document GUC context for synchronous_standby_names/hot_standby_feedback.

Fujii Masao

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Original file line number	Diff line number	Diff line change
`@@ -2107,6 +2107,10 @@ SET ENABLE_SEQSCAN TO OFF;`
`2107`	`2107`	`<xref linkend="guc-synchronous-commit"> parameter to`
`2108`	`2108`	`<literal>local</> or <literal>off</>.`
`2109`	`2109`	`</para>`
	`2110`	`+ <para>`
	`2111`	`+ This parameter can only be set in the <filename>postgresql.conf</>`
	`2112`	`+ file or on the server command line.`
	`2113`	`+ </para>`
`2110`	`2114`	`</listitem>`
`2111`	`2115`	`</varlistentry>`
`2112`	`2116`
`@@ -2239,8 +2243,10 @@ SET ENABLE_SEQSCAN TO OFF;`
`2239`	`2243`	`about queries currently executing on the standby. This parameter can`
`2240`	`2244`	`be used to eliminate query cancels caused by cleanup records, but`
`2241`	`2245`	`can cause database bloat on the primary for some workloads.`
`2242`		`- The default value is <literal>off</literal>. Feedback messages will not`
`2243`		`- be sent more frequently than once per <varname>wal_receiver_status_interval</>.`
	`2246`	`+ Feedback messages will not be sent more frequently than once per`
	`2247`	`+ <varname>wal_receiver_status_interval</>. The default value is`
	`2248`	`+ <literal>off</literal>. This parameter can only be set in the`
	`2249`	`+ <filename>postgresql.conf</> file or on the server command line.`
`2244`	`2250`	`</para>`
`2245`	`2251`	`</listitem>`
`2246`	`2252`	`</varlistentry>`

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