[pgpool-hackers: 4314] Enhancing installation documentation

[Bo Peng]

This patch enhances "2.10. Installation from RPM":
- add detailed decriptions of packages
- mention that  pgpool-II-pgXX-extensions needs to be installed on PostgreSQL servers

https://www.pgpool.net/docs/latest/en/html/install-rpm.html

-- 
Bo Peng <pengbo at sraoss.co.jp>
SRA OSS LLC
https://www.sraoss.co.jp/
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