Обсуждение: pgsql: doc: Fix description about bgwriter and checkpoint in HA section

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

Branch
------
REL9_6_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/5b39f772e2c1670eea2cfde0cc8b08183b010d0e

Modified Files
--------------
doc/src/sgml/high-availability.sgml | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)