* Copyedit simple-network-setup completeness & grammar
* Problem: Member doesn't know their BigchainDB Root URL
Solution: Add a section to tell the Member their BigchainDB Root URL
* Problem: Operator doesn't know how to reset their node
Solution: Add a section with commands an operator can use to reset their node
* Problem: Repeated previous sentence w/o changing it
Solution: Repeat previous sentence but change 'BigchainDB' to 'Tendermint' and delete the parenthetical sentence about MongoDB
* Address the comments by @vrde
