docs: update autonat readme (#3199)

Update readme to link to v2 module

Author: achingbrain

packages/protocol-autonat/README.md

@@ -24,20 +24,15 @@ repo and examine the changes made.
 
 -->
 
-The AutoNAT service uses the [AutoNAT protocol](https://docs.libp2p.io/concepts/nat/autonat/).
-The service confirms addresses are dialable by remote peers, and updates the list it advertises.
+The AutoNAT service implements the [AutoNAT protocol](https://docs.libp2p.io/concepts/nat/autonat/)
+to confirm whether addresses the node is listening on are dialable by remote
+peers.
 
-The service dials randomly selected peers with a request to verify it's external addresses.
-The request includes a list of public multiaddrs (addressManager.getObservedAddrs()).
-The remote peers dial that list and respond with the results.
+It does not implement NAT hole punching.
 
-The AutoNAT service uses those responses to either:
-
-- addressManager.confirmObservedAddr(addr)
-- addressManager.removeObservedAddr(addr)
-
-The result list of candidates and confirmed addresses can be found
-at addressManager.getObservedAddrs()
+> \[!IMPORTANT]
+> [AutoNat v2](https://www.npmjs.com/package/@libp2p/autonat-v2) is now
+> available and should be preferred to this module.
 
 ## Example
 

packages/protocol-autonat/src/index.ts

@@ -1,19 +1,15 @@
 /**
  * @packageDocumentation
  *
- * The AutoNAT service uses the [AutoNAT protocol](https://docs.libp2p.io/concepts/nat/autonat/).
- * The service confirms addresses are dialable by remote peers, and updates the list it advertises.
+ * The AutoNAT service implements the [AutoNAT protocol](https://docs.libp2p.io/concepts/nat/autonat/)
+ * to confirm whether addresses the node is listening on are dialable by remote
+ * peers.
  *
- * The service dials randomly selected peers with a request to verify it's external addresses.
- * The request includes a list of public multiaddrs (addressManager.getObservedAddrs()).
- * The remote peers dial that list and respond with the results.
+ * It does not implement NAT hole punching.
  *
- * The AutoNAT service uses those responses to either:
- * - addressManager.confirmObservedAddr(addr)
- * - addressManager.removeObservedAddr(addr)
- *
- * The result list of candidates and confirmed addresses can be found
- * at addressManager.getObservedAddrs()
+ * > [!IMPORTANT]
+ * > [AutoNat v2](https://www.npmjs.com/package/@libp2p/autonat-v2) is now
+ * > available and should be preferred to this module.
  *
  * @example
  *