[pgpool-committers: 9262] pgpool: Doc: fix restrictions section.

[Tatsuo Ishii]

Doc: fix restrictions section.

- Add mention about SCRAM-SHA-256 authentication
- Add mention about snapshot isolation mode

Branch
------
V4_4_STABLE

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=336f50ff98b8f5ed1c67e24edb094951225b5da8

Modified Files
--------------
doc.ja/src/sgml/restrictions.sgml | 16 ++++++++++------
doc/src/sgml/restrictions.sgml    | 26 ++++++++++++++++----------
2 files changed, 26 insertions(+), 16 deletions(-)