[pgpool-committers: 9732] pgpool: Doc: add release notes.

[Bo Peng]

Doc: add release notes.

Branch
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V4_4_STABLE

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=9af96afb5883ba5ef49505ad42ef923c41b83cdc

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.ja/src/sgml/release-4.4.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 +++++++++++++++++++++++++++++++++++++++
doc/src/sgml/release-4.4.sgml    | 111 +++++++++++++++++++++++++++++++++++++++
8 files changed, 830 insertions(+)