[COMMITTERS] pgsql: Add reference to the NewbieDoc Docbook Guide.

[Bruce Momjian]

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)

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