[pgpool-committers: 9733] pgpool: Doc: add release notes.

[Bo Peng]

Doc: add release notes.

Branch
------
V4_3_STABLE

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=50adf3eb4963d6953356bc806f93fa3ed7fe1087

Modified Files
--------------
doc.ja/src/sgml/release-4.1.sgml |  98 ++++++++++++++++++++++++++++++++++
doc.ja/src/sgml/release-4.2.sgml |  98 ++++++++++++++++++++++++++++++++++
doc.ja/src/sgml/release-4.3.sgml | 104 ++++++++++++++++++++++++++++++++++++
doc/src/sgml/release-4.1.sgml    | 102 +++++++++++++++++++++++++++++++++++
doc/src/sgml/release-4.2.sgml    | 102 +++++++++++++++++++++++++++++++++++
doc/src/sgml/release-4.3.sgml    | 111 +++++++++++++++++++++++++++++++++++++++
6 files changed, 615 insertions(+)