[pgpool-committers: 5424] pgpool: Doc: update 'Preface' chapter for version 4.1.

[Takuma Hoshiai]

Doc: update 'Preface' chapter for version 4.1.

reviewd by Tatsuo Ishii and Bo Peng.

Branch
------
master

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=ea1998b7350de6882bea25fc3634c4f7673adbde

Modified Files
--------------
doc.ja/src/sgml/intro.sgml        | 47 ++++++++++++++++++++++++++++---
doc.ja/src/sgml/restrictions.sgml | 59 +++++++++++++++++++++++++++++++++++----
doc/src/sgml/intro.sgml           | 32 +++++++++++++++++++--
doc/src/sgml/restrictions.sgml    | 37 ++++++++++++++++++++++--
4 files changed, 162 insertions(+), 13 deletions(-)