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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
`@@ -2380,9 +2380,10 @@ LOG: database system is ready to accept read only connections`
`2380`	`2380`	`</para>`
`2381`	`2381`
`2382`	`2382`	`<para>`
`2383`		`- The background writer is active during recovery and will perform`
`2384`		`- restartpoints (similar to checkpoints on the primary) and normal block`
`2385`		`- cleaning activities. This can include updates of the hint bit`
	`2383`	`+ The checkpointer process and the background writer process are active during`
	`2384`	`+ recovery. The checkpointer process will perform restartpoints (similar to`
	`2385`	`+ checkpoints on the primary) and the background writer process will perform`
	`2386`	`+ normal block cleaning activities. This can include updates of the hint bit`
`2386`	`2387`	`information stored on the standby server.`
`2387`	`2388`	`The <command>CHECKPOINT</command> command is accepted during recovery,`
`2388`	`2389`	`though it performs a restartpoint rather than a new checkpoint.`

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