Log Message:
-----------
Update wording of installation when upgrading, to more clearly
distinguish major vs minor release upgrades.
Modified Files:
--------------
pgsql/doc/src/sgml:
installation.sgml (r1.275 -> r1.276)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/installation.sgml.diff?r1=1.275&r2=1.276)