Commit749320c

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Document BaseBackupSync and BaseBackupWrite wait events.

Commit3500ccc should have donethis, but I overlooked it.Per complaint from Thomas Munro.Discussion:http://postgr.es/m/CA+hUKGJixAHc860Ej9Qzd_z96Z6aoajAgJ18bYfV3Lfn6t9=+Q@mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -1251,6 +1251,14 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser`
`1251`	`1251`	`<entry><literal>BaseBackupRead</literal></entry>`
`1252`	`1252`	`<entry>Waiting for base backup to read from a file.</entry>`
`1253`	`1253`	`</row>`
	`1254`	`+ <row>`
	`1255`	`+ <entry><literal>BaseBackupSync</literal></entry>`
	`1256`	`+ <entry>Waiting for data written by a base backup to reach durable storage.</entry>`
	`1257`	`+ </row>`
	`1258`	`+ <row>`
	`1259`	`+ <entry><literal>BaseBackupWrite</literal></entry>`
	`1260`	`+ <entry>Waiting for base backup to write to a file.</entry>`
	`1261`	`+ </row>`
`1254`	`1262`	`<row>`
`1255`	`1263`	`<entry><literal>BufFileRead</literal></entry>`
`1256`	`1264`	`<entry>Waiting for a read from a buffered file.</entry>`

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