Add note about mDNS with KVM bridged networking

[chrwei]

Proposed change

Add additional instruction for KVM. trustGuestRxFilters is required to support multicast, and thus mDNS. Without it, some of the instructions and guides won't work as-is. Most notably, homeassistant.local won't resolve, and Google Cast devices won't be found.

Type of change

• [X ] Adjusted missing or incorrect information in the current documentation (current branch).

Checklist

• [X ] This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• [X ] The documentation follows the Home Assistant documentation [standards][].

[homeassistant]

Hi @chrwei,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

[frenck]

Thanks, @chrwei 👍