Merge branch 'update-09-2020' into 'master'

Add testnet in a box resources to developer tools.

See merge request zcash-docs/zcash-docs!198

source/rtd_pages/dev_tools.md

@@ -2,13 +2,19 @@
 
 Here are the most helpful tools to test and debug code.
 
-## Zcashd RPC Docs
+## Zcashd/Zcash-cli RPC Docs
 
 Thee [Zcash RPC webpage](https://zcash-rpc.github.io/) makes it easy to look at zcashd commands, their parameters, and examples. The content on that page is the formatted help text for each of the Zcash RPC calls, extracted by an open sourced tool. This is one of the most frequently used resources by core developers. 
 
-## Test Network
+## Public Test Network
 
-The [Zcash testnet](testnet_guide.html) is a blockchain that attempts to mimic the main Zcash network for testing purposes, with its own coins that hold no monetary value (TAZ). It's used by developers to experiment with Zcash apps having to use Zcash (ZEC) and test network upgrades before activating on the main Zcash network. We  recommend developers to use testnet for development and testing. 
+The [Zcash testnet](testnet_guide.html) is a blockchain that attempts to mimic the main Zcash network for testing purposes, with its own coins that hold no monetary value (TAZ). It's used by developers to experiment with Zcash apps having to use Zcash (ZEC) and test network upgrades before activating on the main Zcash network. Since it's public and long-running, you can see a lot of historical data, and interact with many peers. 
+
+## Private Containerized Network
+
+The [Zcash testnet-in-a-box (TNB))](https://github.com/zcash-hackworks/zcash-testnet-in-a-box) will deploy a collection of monitored and peered zcashd instances to a Kubernetes cluster. This is useful for isolated testing in a controlled environent, giving you the control of how many node are on the network, how many transactions are sent and mined, etc. New protocol development, or research on new RPCs will benefit greatly from this tool. 
+
+<iframe width="560" height="315" src="https://www.youtube.com/embed/1360lSmfhnw" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
 
 ## Block Explorer