[pgpool-committers: 8752] pgpool: Doc: add release notes.

[Bo Peng]

Doc: add release notes.

Branch
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V4_0_STABLE

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=3203a538c66948c99b4afec972bbea9e90a125e0

Modified Files
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doc.ja/src/sgml/release-3.7.sgml | 128 ++++++++++++++++++++++++++++++++++
doc.ja/src/sgml/release-4.0.sgml | 147 +++++++++++++++++++++++++++++++++++++++
doc/src/sgml/release-3.7.sgml    | 124 +++++++++++++++++++++++++++++++++
doc/src/sgml/release-4.0.sgml    | 143 +++++++++++++++++++++++++++++++++++++
4 files changed, 542 insertions(+)