Re: pgsql: docs: fist draft version of the PG 12 release notes

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<para>
Move recovery.conf settings into postgresql.conf (Fujii Masao, Simon Riggs, Abhijit Menon-Sen, Sergei Kornilov)
</para>

<para>
recovery.conf is no longer used, and recovery.signal and standby.signal are used to switch into non-primary mode.
trigger_file has been renamed to promote_trigger_file.  The standby_mode setting has been removed.
</para>
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In addition to these, I think it would be better to warn that if
there's a file named "recovery.conf" on stabdby node, postmaster won't
start up:

21909 2019-05-09 07:55:55 JST FATAL:  using recovery command file "recovery.conf" is not supported
21907 2019-05-09 07:55:55 JST LOG:  startup process (PID 21909) exited with exit code 1
21907 2019-05-09 07:55:55 JST LOG:  aborting startup due to startup process failure
21907 2019-05-09 07:55:55 JST LOG:  database system is shut down

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp