Log Message:
-----------
Wording improvement for pl/proxy mention.
Modified Files:
--------------
pgsql/doc/src/sgml:
high-availability.sgml (r1.20 -> r1.21)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/high-availability.sgml?r1=1.20&r2=1.21)