chore(doc): comment channel routes

src/routes/channels/message_delete.rs

@@ -1,5 +1,9 @@
 use revolt_quark::{models::User, perms, Db, EmptyResponse, Error, Permission, Ref, Result};
 
+/// # Delete Message
+///
+/// Delete a message you've sent or one you have permission to delete.
+#[openapi(tag = "Messaging")]
 #[delete("/<target>/messages/<msg>")]
 pub async fn req(db: &Db, user: User, target: Ref, msg: Ref) -> Result<EmptyResponse> {
     let message = msg.as_message(db).await?;