Thread: pgsql: Update wording of installation when upgrading, to more clearly

Log Message:
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Update wording of installation when upgrading, to more clearly
distinguish major vs minor release upgrades.

Modified Files:
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    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)