Thread: pgsql: Update Windows installation notes.

Log Message:
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Update Windows installation notes.

pginstaller isn't used anymore, in favor of the one-click installers.
Make it clear that we support Windows 2000 and newer with the native
port, instead of first saying we support NT4 and then saying we don't.

Modified Files:
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    pgsql/doc/src/sgml:
        installation.sgml (r1.336 -> r1.337)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/installation.sgml?r1=1.336&r2=1.337)