MoQ - Add FAQ and entry re: Safari

Adds some info about the status of Safari's WebTransport implementation

Author: englishm-cloudflare

src/content/docs/moq/index.mdx

@@ -16,3 +16,11 @@ MoQ is designed to be an Internet infrastructure level service that provides med
 Cloudflare's implementation of MoQ currently supports a subset of the [draft-07 MoQ Transport specfication](https://datatracker.ietf.org/doc/html/draft-ietf-moq-transport-07).
 
 For the most up-to-date documentation on the protocol, please visit the IETF working group documentation.
+
+## Frequently Asked Questions
+
+* What about Safari?
+
+  Safari does not yet have fully functional WebTransport support. Apple never publicly commits to timelines for new features like this. However, Apple has indicated their [intent to support WebTransport](https://github.com/WebKit/standards-positions/issues/18#issuecomment-1495890122). An Apple employee is even a co-author of the [WebTransport over HTTP/3](https://datatracker.ietf.org/doc/draft-ietf-webtrans-http3/) draft. Since Safari 18.4 (2025-03-31), an early (not yet fully functional) implementation of the WebTransport API has been available for testing behind a developer-mode / advanced settings feature flag (including on iOS).
+
+  Until Safari has a fully functional WebTransport implementation, some MoQ use cases may require a fallback to WebRTC, or, in some cases, WebSockets.