[pgpool-committers: 10456] pgpool: Doc: update release note.

[Bo Peng]

Doc: update release note.

Branch
------
V4_2_STABLE

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=8e23d62b89514d74a84c739bdf3d9b654b7000ad

Modified Files
--------------
doc.ja/src/sgml/release-4.2.sgml | 108 ++++++++++++++++++++++++++++++++--
doc/src/sgml/release-4.2.sgml    | 122 +++++++++++++++++++++++++++++++++++++--
2 files changed, 222 insertions(+), 8 deletions(-)