Log Message:-----------Add reference to the NewbieDoc Docbook Guide.
Modified Files:-------------- pgsql/doc/src/sgml: docguide.sgml (r1.51 -> r1.52) (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/docguide.sgml.diff?r1=1.51&r2=1.52)
