[DOCS] ALTER SYSTEM is equal to editing postgresql.auto.conf,not postgres.conf

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.6/static/config-setting.html
Description:

> The already-mentioned ALTER SYSTEM command provides a SQL-accessible means
of changing global defaults; it is functionally equivalent to editing
postgresql.conf

Should not it be ...to editing postgresql.auto.conf?.. I know user is not
supposed to edit postgresql.auto.conf but this is what ALTER SYSTEM does,
not touching the postgres.conf - isn't is confusing in manual?..

Thank you