[pgpool-committers: 10539] pgpool: Doc: add description for --with-ldap option of configure.

[Tatsuo Ishii]

Doc: add description for --with-ldap option of configure.

It was missed when LDAP support was introduced in v4.2
Backpatch-through: v4.2

Branch
------
V4_2_STABLE

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=6b4d5bed82b8ab1a09eabf46b30b9b3ab87b0246

Modified Files
--------------
doc.ja/src/sgml/installation.sgml | 11 ++++++++++-
doc/src/sgml/installation.sgml    | 14 +++++++++++++-
2 files changed, 23 insertions(+), 2 deletions(-)