[pgpool-committers: 7095] pgpool: Add Pgpool-II 4.2 English release notes.

[Tatsuo Ishii]

Add Pgpool-II 4.2 English release notes.

Branch
------
master

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=baa683ad0c3286e69a106ea1660e21b4335513df

Modified Files
--------------
doc/src/sgml/filelist.sgml    |   1 +
doc/src/sgml/release-4.2.sgml | 974 ++++++++++++++++++++++++++++++++++++++++++
doc/src/sgml/release.sgml     |   1 +
3 files changed, 976 insertions(+)