Log Message:
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Remove obsolete claim that gzip is needed while installing PG's documentation.
It isn't, now that we ship the docs as loose files rather than a sub-tarball.
Also adjust the wording in a couple of places to make the lists of required
software read more consistently.
Modified Files:
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pgsql/doc/src/sgml:
installation.sgml (r1.352 -> r1.353)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/installation.sgml?r1=1.352&r2=1.353)