pgsql: Mark 8.2 release as 2006-??, not 2005-??, per observation by

Log Message:
-----------
Mark 8.2 release as 2006-??, not 2005-??, per observation by David
Wheeler.

Modified Files:
--------------
pgsql/doc/src/sgml:
release.sgml (r1.473 -> r1.474)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/release.sgml.diff?r1=1.473&r2=1.474)