Remove extra backslash (#5074)

There was an extra backslash, I removed it.

Author: TheUntraceable

docs/resources/Channel.md

@@ -269,7 +269,7 @@ Represents a message sent in a channel within Discord.
 
 \* The author object follows the structure of the user object, but is only a valid user in the case where the message is generated by a user or bot user. If the message is generated by a webhook, the author object corresponds to the webhook's id, username, and avatar. You can tell if a message is generated by a webhook by checking for the `webhook_id` on the message object.
 
-\*\*\ Not all channel mentions in a message will appear in `mention_channels`. Only textual channels that are visible to everyone in a lurkable guild will ever be included. Only crossposted messages (via Channel Following) currently include `mention_channels` at all. If no mentions in the message meet these requirements, this field will not be sent.
+\*\* Not all channel mentions in a message will appear in `mention_channels`. Only textual channels that are visible to everyone in a lurkable guild will ever be included. Only crossposted messages (via Channel Following) currently include `mention_channels` at all. If no mentions in the message meet these requirements, this field will not be sent.
 
 \*\*\* This field is only returned for messages with a `type` of `19` (REPLY) or `21` (THREAD_STARTER_MESSAGE). If the message is a reply but the `referenced_message` field is not present, the backend did not attempt to fetch the message that was being replied to, so its state is unknown. If the field exists but is null, the referenced message was deleted.