Mention mDNS behaviour change in cast docs (#13380)

Explicitly mention that mDNS discovery is now mandatory as of
version 109 of Home Assistant. This ensures users who are upgrading
with an unsupported configuration are aware that this behaviour has changed,
so they must make the appropriate changes to their infrastructure.
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@ -76,3 +76,5 @@ If this is not possible, it's necessary to:
- Enable mDNS forwarding between the subnets.
- Enable source NAT to make requests from Home Assistant to the Chromecast appear to come from the same subnet as the Chromecast.
Note that this functionality was changed in [release 109](https://www.home-assistant.io/blog/2020/04/29/release-109/) of Home Assistant, making mDNS discovery mandatory.