Обсуждение: pgsql: doc: Fix description WAL writer in glossary

doc: Fix description WAL writer in glossary

The WAL writer is an auxiliary process, but its description in the
glossary did not match that.

This is inexact since d3014fff4cd4.

Author: Masahiro Ikeda
Discussion: https://postgr.es/m/d3a5a4278fd8d9e7a47c6aa4db9e9a39@oss.nttdata.com
Backpatch-through: 15

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/d0b0454d3808c7d5294c548aa9f0ee137430e183

Modified Files
--------------
doc/src/sgml/glossary.sgml | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)