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

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Original file line number	Diff line number	Diff line change
`@@ -5316,11 +5316,12 @@ int PQsetnonblocking(PGconn *conn, int arg);`
`5316`	`5316`	`</para>`
`5317`	`5317`
`5318`	`5318`	`<para>`
`5319`		`- In the nonblocking state, calls to`
	`5319`	`+ In the nonblocking state,successfulcalls to`
`5320`	`5320`	`<xref linkend="libpq-PQsendQuery"/>, <xref linkend="libpq-PQputline"/>,`
`5321`	`5321`	`<xref linkend="libpq-PQputnbytes"/>, <xref linkend="libpq-PQputCopyData"/>,`
`5322`		`- and <xref linkend="libpq-PQendcopy"/> will not block but instead return`
`5323`		`- an error if they need to be called again.`
	`5322`	`+ and <xref linkend="libpq-PQendcopy"/> will not block; their changes`
	`5323`	`+ are stored in the local output buffer until they are flushed.`
	`5324`	`+ Unsuccessful calls will return an error and must be retried.`
`5324`	`5325`	`</para>`
`5325`	`5326`
`5326`	`5327`	`<para>`

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