Update msg-tlb.mdx

Author: tsivarev

docs/develop/data-formats/msg-tlb.mdx

@@ -148,7 +148,7 @@ int_msg_info$0 ihr_disabled:Bool bounce:Bool bounced:Bool
 
 ### ext_in_msg_info$10
 
-`ext_in_msg_info$10` is a case of external incoming message. This means this type of messages sent from contracts to off-chain space.\
+`ext_in_msg_info$10` is a case of external incoming message. This means this type of messages sent from contracts to off-chain space.
 Use case - wallet application request to wallet contract.