The following bug has been logged on the website:
Bug reference: 7652
Logged by: Andreas H.
Email address: Andreas.Heiduk@web.de
PostgreSQL version: 9.2.1
Operating system: any
Description: =
It seems, that none of the functions in the section "Additional Supplied
Modules" are listed in the index. I checked both the "intagg" module and the
"dblink" module.
To bad if you are looking the documentation of a function but don't know
which module provides it (if any at all).