[COMMITTERS] pgsql: Add markup for GUC mention in docs.

[Bruce Momjian]

Log Message:
-----------
Add markup for GUC mention in docs.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        func.sgml (r1.277 -> r1.278)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.277&r2=1.278)

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