[HACKERS] [COMMITTERS] pgsql: Add new GUC, max_worker_processes, limiting number of bgworkers.

[Kevin Hale Boyes]

The change to config.sgml contains a small typo with the double r in the
xreflabel.

+      <varlistentry id="guc-max-worker-processes"
xreflabel="max_worrker_processes">