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doc: Fix description about bgwriter and checkpoint in HA section

Since806a2ae, the work of the bgwriter is split the checkpointer, but aportion of the documentation did not get the message.Author: Masahiko SawadaDiscussion:https://postgr.es/m/CA+fd4k6jXxjAtjMVC=wG3=QGpauZBtcgN3Jhw+oV7zXGKVLKzQ@mail.gmail.comBackpatch-through: 9.5

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Original file line number	Diff line number	Diff line change
`@@ -2361,9 +2361,10 @@ LOG: database system is ready to accept read only connections`
`2361`	`2361`	`</para>`
`2362`	`2362`
`2363`	`2363`	`<para>`
`2364`		`- The background writer is active during recovery and will perform`
`2365`		`- restartpoints (similar to checkpoints on the primary) and normal block`
`2366`		`- cleaning activities. This can include updates of the hint bit`
	`2364`	`+ The checkpointer process and the background writer process are active during`
	`2365`	`+ recovery. The checkpointer process will perform restartpoints (similar to`
	`2366`	`+ checkpoints on the primary) and the background writer process will perform`
	`2367`	`+ normal block cleaning activities. This can include updates of the hint bit`
`2367`	`2368`	`information stored on the standby server.`
`2368`	`2369`	`The <command>CHECKPOINT</> command is accepted during recovery,`
`2369`	`2370`	`though it performs a restartpoint rather than a new checkpoint.`

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