fix: main.md typo (#3278)

packages => package

docs/docs/dev_docs/cli/main.md

@@ -8,7 +8,7 @@ The Aztec Sandbox is an environment for local development on the Aztec Network.
 
 Aztec's Layer 2 network is a fully programmable combined private/public ZK rollup. To achieve this, the network contains the following primary components:
 
-- Aztec Node - Aggregates all of the 'backend' services necessary for the building and publishing of rollups. This packages is currently in development and much of the functionality is mocked.
+- Aztec Node - Aggregates all of the 'backend' services necessary for the building and publishing of rollups. This package is currently in development and much of the functionality is mocked.
 - [Private Execution Environment (PXE)](https://github.com/AztecProtocol/aztec-packages/tree/master/yarn-project/pxe) - Normally residing with the end client, this decrypts and stores a client's private state, executes simulations and submits transactions to the Aztec Node.
 - [Aztec.js](https://github.com/AztecProtocol/aztec-packages/tree/master/yarn-project/aztec.js) - Aztec's client library for interacting with the PXE (think Ethers.js). See the getting started guide [here](../getting_started/aztecjs-getting-started.md).