Update ConfigState documentation.
Update ConfigState documentation.

There is now support for concurrent configuration through the use of
SpewState instances.  Update the documenation to properly reflect this.

davecgh/go-spew,bparees/go-spew,dvln/go-spew,dvln/go-spew,kortschak/utter,davecgh/go-spew,bparees/go-spew,FactomProject/go-spew,FactomProject/go-spew