[pgpool-committers: 6750] pgpool: Doc: add explanation about .pgpoolkey.

[Tatsuo Ishii]

Doc: add explanation about .pgpoolkey.

Also add indexes for .pgpoolkey and PGPOOLKEYFILE.

Branch
------
V4_0_STABLE

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=47abf7da7b8a054142aeb737592a2e9b3d1f0d61

Modified Files
--------------
doc.ja/src/sgml/client-auth.sgml | 3 +++
doc/src/sgml/client-auth.sgml    | 4 ++++
2 files changed, 7 insertions(+)