Returns the ID of a mentioned channel, similar to the $mentioned function but pertains to channel mentions.
argNumber - Represents the mentioned argument position.
yes - If the 2nd field is defined as yes and no mentions are found in the command message, the function returns the ID of the channel where the command was executed.
This is the id of the channel you mentioned!: $mentionedChannels
$onlyIf[$mentionedChannels!=;You must mention a valid channel!]