BUG #4649: unclear in create trigger - complete example

The following bug has been logged online:

Bug reference:      4649
Logged by:          Tommy
Email address:      csckcac@gmail.com
PostgreSQL version: 8.3
Operating system:   CentOS 5.1
Description:        unclear in create trigger - complete example
Details:

please add hyperlink
http://www.postgresql.org/docs/8.3/static/xfunc-c.html#DFUNC
into
http://www.postgresql.org/docs/8.3/static/trigger-example.html

I found it is difficult to understand how to compile a C language PROCEDURE
until i found the link above.

Thanks, tommy