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Update docs to say you need fsync to make sync rep work fast.

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Original file line number	Diff line number	Diff line change
`@@ -947,7 +947,7 @@ synchronous_replication = on`
`947`	`947`	`<para>`
`948`	`948`	`After a commit record has been written to disk on the primary the`
`949`	`949`	`WAL record is then sent to the standby. The standby sends reply`
`950`		`- messages each time a new batch of WAL data isreceived, unless`
	`950`	`+ messages each time a new batch of WAL data iswritten to disk, unless`
`951`	`951`	`<varname>wal_receiver_status_interval</> is set to zero on the standby.`
`952`	`952`	`If the standby is the first matching standby, as specified in`
`953`	`953`	`<varname>synchronous_standby_names</> on the primary, the reply`
`@@ -1013,6 +1013,12 @@ synchronous_replication = on`
`1013`	`1013`	`the rate of generation of WAL data.`
`1014`	`1014`	`</para>`
`1015`	`1015`
	`1016`	`+ <para>`
	`1017`	`+ Replies are only sent when WAL is written to disk, so setting`
	`1018`	`+ <varname>fsync</> to <literal>off</> on the standby will significantly`
	`1019`	`+ reduce performance of synchronous replication and should be avoided.`
	`1020`	`+ </para>`
	`1021`	`+`
`1016`	`1022`	`</sect3>`
`1017`	`1023`
`1018`	`1024`	`<sect3 id="synchronous-replication-ha">`

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