Commita31212b

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Change postgresql.conf.sample to say that fsync=off will corrupt data.

Discussion: 24748.1461764666@sss.pgh.pa.usPer a suggestion from Craig Ringer. This wording from Tom Lane,following discussion.

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Original file line number	Diff line number	Diff line change
`@@ -182,7 +182,9 @@`
`182`	`182`
`183`	`183`	`#wal_level = minimal# minimal, replica, or logical`
`184`	`184`	`# (change requires restart)`
`185`		`-#fsync = on# turns forced synchronization on or off`
	`185`	`+#fsync = on# flush data to disk for crash safety`
	`186`	`+# (turning this off can cause`
	`187`	`+# unrecoverable disk corruption)`
`186`	`188`	`#synchronous_commit = on# synchronization level;`
`187`	`189`	`# off, local, remote_write, remote_apply, or on`
`188`	`190`	`#wal_sync_method = fsync# the default is the first option`

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