Add note about mqtt special chars when using uplink. #2002
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What did you change
Add a note about using problematic chars in channel names when using MQTT.
Why did you change it
I had a hard time figuring out why DMs and messages to LongFast where published to my MQTT server, but not messages to "Channel#1" - After spending a couple of hours on various things like factory reset, reflashing, messing up my config even further etc. I finally realized that my messages couldn't be published because my Channel Name was incompatible with MQTT. I hope that adding this note will prevent others going down the same rabbit hole as I did.