9.6 synchronous_standby_names: discrepancy between docs and functionality

Hi Folks,

9.6 dev installed from RPM.  The version according to yum is:
Release     : git20160325_1PGDG.rhel7

The docs state the following as an example of synchronous_standby_names for=
 multiple sync standby's
synchronous_standby_names =3D '2 (s1, s2, s3)'

When you try and use this example, it fails:

syncrep=3D# alter system set synchronous_standby_names=3D'2 (s1, s2, s3)';
ERROR:  invalid value for parameter "synchronous_standby_names": "2 (s1, s2=
, s3)"
DETAIL:  List syntax is invalid.

If you remove the space from between the 2 & the ( it works:

syncrep=3D# alter system set synchronous_standby_names=3D'2(s1, s2, s3)';
ALTER SYSTEM

Thanks,
Brad.