max_sync_workers_per_subscription is missing in postgresql.conf

Hi all,

Attached a patch for $subject.

I added this parameter into "Asynchronous Behavior" section of
"RESOURCE" section. But GUC parameter for subscriber now is written in
this section, in spite of there is "REPLICATION" section. I think that
we can coordinate these parameters to not confuse user. For example in
documentation, these parameters are described in "19.6.4. Subscribers"
section of "19.6. Replication" section. Thought?

Regards,

--
Masahiko Sawada
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center