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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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Original file line number	Diff line number	Diff line change
`@@ -4941,11 +4941,12 @@ int PQsetnonblocking(PGconn *conn, int arg);`
`4941`	`4941`	`</para>`
`4942`	`4942`
`4943`	`4943`	`<para>`
`4944`		`- In the nonblocking state, calls to`
	`4944`	`+ In the nonblocking state,successfulcalls to`
`4945`	`4945`	`<function>PQsendQuery</function>, <function>PQputline</function>,`
`4946`	`4946`	`<function>PQputnbytes</function>, <function>PQputCopyData</function>,`
`4947`		`- and <function>PQendcopy</function> will not block but instead return`
`4948`		`- an error if they need to be called again.`
	`4947`	`+ and <function>PQendcopy</function> will not block; their changes`
	`4948`	`+ are stored in the local output buffer until they are flushed.`
	`4949`	`+ Unsuccessful calls will return an error and must be retried.`
`4949`	`4950`	`</para>`
`4950`	`4951`
`4951`	`4952`	`<para>`

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