Channel info for Forum channels

Normal channels have channel info that appears next to the title of the channel that helps people understand the purpose of the channel; Forum channels have a big blank space up there and there's no way to add context to help users understand the purpose of the channel.

For a quick example of this in the wild: the server I mod has a forum channel called "feedback please" that people are supposed to use to post in-progress projects they're working on so they can get feedback from other community members. We set it up as a forum rather than a conventional channel because that way each project gets its own conversational space. But new people keep thinking it's asking for feedback to mods about the community itself. We've changed its title several times but all that happens is it makes it less clear what the channel is for.

I added "Use this forum to ask for feedback on music you're working on. Create a new post for the track/piece you want to get some critique/support on!" into the post guidelines for that forum but those don't show up until you actually start making a new post, and a user who doesn't know what the channel is for isn't prepared to start making a new post for the right reasons.

I feel like it might be fairly trivial to add a "Channel Topic" field to Forum channels, just like regular channels, or if not, to just display the post guidelines for Forum channels at the top, where "channel topic" would be on a conventional channel, and which is currently, on a Forum channel, completely blank.