doc: merge ecpg username/password example into C comment

Bruce Momjian <bruce@momjian.us>

Commit: d309be0fb7246cc2ebfbdcb2e4781f956c0d7d12
Author: Bruce Momjian <bruce@momjian.us>
Date: 2013-01-25T18:46:38Z
Releases: 9.3.0
doc:  merge ecpg username/password example into C comment

Backpatch to 9.2

per Tom Lane

Files

PathChange+/−
doc/src/sgml/ecpg.sgml modified +1 −2