PR#38084 Correct DBDParams string in example INOUE Seiichiro (who reported the bug) suggests referencing the pgsql documentation. I disagree, but I wonder if PgSQL is really a good choice of example, since it (untypically) parses the params itself rather than have the apr_dbd driver do it.
httpd/httpd/branches/2.2.x/docs/manual/mod/mod_authn_dbd.xml
httpd/httpd/trunk/docs/manual/mod/mod_authn_dbd.xml