Docs: inaccurate description about config settings

Hi, hackers

When I setup a stream replication I found that the documentation says that promote_trigger_file
parameter can only be set in the postgresql.conf file or on the server command line, however, it
can also be put into postgresql.auto.conf. If I use include to import a new config, it works too.

There are many parameters use this description:
$ grep 'This parameter can only be set in the' -rn doc/
doc/src/sgml/sepgsql.sgml:273: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:1001: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:1040: for details. This parameter can only be set in the
doc/src/sgml/config.sgml:1071: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:1133: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:1151: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:1169: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:1187: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:1204: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:1232: This parameter can only be set in the
doc/src/sgml/config.sgml:1307: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:1334: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:1411: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:1445: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:1471: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:2180: of 10. This parameter can only be set in the
doc/src/sgml/config.sgml:2199: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:2227: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:2259: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:2817: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:2863: This parameter can only be set in the <filename>postgresql.conf</filename>
doc/src/sgml/config.sgml:3012: next higher multiple of 10. This parameter can only be set in the
doc/src/sgml/config.sgml:3036: This parameter can only be set in the
….

I think this description is misleading. we should correct it, isn't it?

Regards,
Japin Li