max_worker_processes default not documented

While this may be in the postgresql.conf it's absence in the docs is made
noticeable by the fact both the immediately preceding and subsequent items
in the 9.6 docs specify their default values. Furthermore,
max_parallel_degree defaults to 2 but the workers come from the pool sized
using max_worker_processes - provoking the very question as to how many is
2 relative to the default pool size.

http://www.postgresql.org/docs/devel/static/runtime-config-resource.html#GUC-MAX-PARALLEL-DEGREE

David J.