[pgpool-committers: 5470] pgpool: Add release-notes 3.7.8-3.4.22.

[Bo Peng]

Add release-notes 3.7.8-3.4.22.

Branch
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V3_7_STABLE

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=0189aed1c2688c3024f01fb5e483a121721fdd91

Modified Files
--------------
doc.ja/src/sgml/release-3.4.sgml |  86 ++++++++++++++++++
doc.ja/src/sgml/release-3.5.sgml | 113 ++++++++++++++++++++++++
doc.ja/src/sgml/release-3.6.sgml | 160 +++++++++++++++++++++++++++++++++
doc.ja/src/sgml/release-3.7.sgml | 186 +++++++++++++++++++++++++++++++++++++++
doc/src/sgml/release-3.4.sgml    |  63 +++++++++++++
doc/src/sgml/release-3.5.sgml    |  84 ++++++++++++++++++
doc/src/sgml/release-3.6.sgml    | 116 ++++++++++++++++++++++++
doc/src/sgml/release-3.7.sgml    | 134 ++++++++++++++++++++++++++++
8 files changed, 942 insertions(+)