Incorrect documentation about pg_stat_activity

Hi,

In the documentation[1], there is the following description:

"pg_stat_activity does not show an entry for the Startup process"

However, the current pg_stat_activity show startup process's entry.

postgres=# select pid, backend_type from pg_stat_activity ;
pid | backend_type
-------+-------------------
27314 | client backend
27103 | startup
27113 | background writer
27112 | checkpointer
27115 | walreceiver
(5 rows)

Attached is a patch for the documentation fix.

Regards,

[1]
26.5.3. Administrator's Overview
https://www.postgresql.org/docs/10/static/hot-standby.html#hot-standby-admin

--
Yugo Nagata <nagata(at)sraoss(dot)co(dot)jp>