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doc: correct description of libpq's PQsetnonblocking() mode

Reported-by: Yugo NAGATADiscussion:https://postgr.es/m/20210713115949.702986955f8ccf23fa81073c@sraoss.co.jpBackpatch-through: 12-16, master already done

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Lines changed: 4 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -4790,11 +4790,12 @@ int PQsetnonblocking(PGconn *conn, int arg);`
`4790`	`4790`	`</para>`
`4791`	`4791`
`4792`	`4792`	`<para>`
`4793`		`- In the nonblocking state, calls to`
	`4793`	`+ In the nonblocking state,successfulcalls to`
`4794`	`4794`	`<xref linkend="libpq-PQsendQuery"/>, <xref linkend="libpq-PQputline"/>,`
`4795`	`4795`	`<xref linkend="libpq-PQputnbytes"/>, <xref linkend="libpq-PQputCopyData"/>,`
`4796`		`- and <xref linkend="libpq-PQendcopy"/> will not block but instead return`
`4797`		`- an error if they need to be called again.`
	`4796`	`+ and <xref linkend="libpq-PQendcopy"/> will not block; their changes`
	`4797`	`+ are stored in the local output buffer until they are flushed.`
	`4798`	`+ Unsuccessful calls will return an error and must be retried.`
`4798`	`4799`	`</para>`
`4799`	`4800`
`4800`	`4801`	`<para>`

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