Commit c8f78b61 added a new reloption to enable inserts in parallel-mode
but forgot to update at one of the places about the same in docs. In
passing, fix a typo in the same commit.

Reported-by: Justin Pryzby
Author: Justin Pryzby
Reviewed-by: "Hou, Zhijie", Amit Kapila
Discussion: https://postgr.es/m/20210318025228.GE11765@telsasoft.com