Add persistent link to Release Notes Discord channel, split doc and c…

…ode change lists (MystenLabs#4103)

doc/src/learn/index.md

@@ -12,6 +12,8 @@ For a deep dive into Sui technology, see the [Sui Smart Contracts Platform](http
 
 ## See what's new
 
+### Doc updates
+
 The following list includes the recent updates to Sui and the documentation:
 
 * Interact with the Sui network using our new [Rust SDK](../build/rust-sdk.md), a collection of Rust language [JSON-RPC wrapper and crypto utilities](https://github.com/MystenLabs/sui/tree/main/crates/sui-sdk).
@@ -21,14 +23,18 @@ The following list includes the recent updates to Sui and the documentation:
 * Find a list of [single-writer apps](../learn/single-writer-apps.md) that would benefit from Sui's advantages in handling [simple transactions](../learn/how-sui-works.md#simple-transactions).
 * Install the [Sui Wallet Browser Extension](../explore/wallet-browser.md) to create NFTs, transfer coins, and carry out common transactions in a Chrome tab.
 
+See the Sui `doc/src` [history](https://github.com/MystenLabs/sui/commits/main/doc/src) for a complete changelog of updates to this site. 
+
+### Code changes
+
+Learn about the latest releases in the [#release-notes](https://discord.com/channels/916379725201563759/974444055259910174) channel on Discord.
+
 For a complete view of all changes in the Sui `devnet` branch, see:
 https://github.com/MystenLabs/sui/commits/devnet
 
 For upstream updates in the `main` branch, see:
 https://github.com/MystenLabs/sui/commits/main
 
-See the Sui `doc/src` [history](https://github.com/MystenLabs/sui/commits/main/doc/src) for a complete changelog of updates to this site. 
-
 ## Kickstart development
 The links in the section point to information to help you start working with Sui.