doc: Fix description about bgwriter and checkpoint in HA section

Michael Paquier <michael@paquier.xyz>

Commit: 812b2165b0c533999398dfc9c35298c43ef6030a
Author: Michael Paquier <michael@paquier.xyz>
Date: 2020-08-17T01:24:38Z
Releases: 10.15
doc: Fix description about bgwriter and checkpoint in HA section

Since 806a2ae, the work of the bgwriter is split the checkpointer, but a
portion of the documentation did not get the message.

Author: Masahiko Sawada
Discussion: https://postgr.es/m/CA+fd4k6jXxjAtjMVC=wG3=QGpauZBtcgN3Jhw+oV7zXGKVLKzQ@mail.gmail.com
Backpatch-through: 9.5

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doc/src/sgml/high-availability.sgml modified +4 −3

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