docs: make it clear Web RTC Direct is experimental

docs/changelogs/v0.24.md

@@ -10,7 +10,7 @@
   - [Gateway: the root of the CARs are no longer meaningful](#gateway-the-root-of-the-cars-are-no-longer-meaningful)
   - [IPNS: improved publishing defaults](#ipns-improved-publishing-defaults)
   - [IPNS: record TTL is used for caching](#ipns-record-ttl-is-used-for-caching)
-  - [WebRTC Direct Transport](#webrtc-direct-transport)
+  - [Experimental Transport: WebRTC Direct](#experimental-transport-webrtc-direct)
 - [📝 Changelog](#-changelog)
 - [👨‍👩‍👧‍👦 Contributors](#-contributors)
 
@@ -69,7 +69,7 @@ DHT, for updates. The TTL value in the IPNS record now serves as a hint for:
 These changes make it easier for rarely updated IPNS-hosted websites to be
 cached more efficiently and load faster in browser contexts.
 
-#### WebRTC Direct Transport
+#### Experimental Transport: WebRTC Direct
 
 [WebRTC Direct](https://github.com/libp2p/go-libp2p/pull/2337) has now been introduced
 in [`go-libp2p`](https://github.com/libp2p/go-libp2p/releases/tag/v0.32.0) v0.32.0. This

docs/config.md

@@ -2075,6 +2075,8 @@ Type: `flag`
 
 #### `Swarm.Transports.Network.WebRTCDirect`
 
+**Experimental:** the support for WebRTC Direct is currently experimental.
+
 A new feature of [`go-libp2p`](https://github.com/libp2p/go-libp2p/releases/tag/v0.32.0)
 is the [WebRTC Direct](https://github.com/libp2p/go-libp2p/pull/2337) transport.