Modules Tutorial Page Has Extra Error Code Block fix (ocaml#517)

Author: MirzaBabarBaig

data/tutorials/lg_03_modules.md

@@ -118,15 +118,12 @@ let hello () = print_endline "Hello"
 
 As it is, `Amodule` has the following interface:
 
+<!-- $MDX skip -->
 ```ocaml
 val message : string
 
 val hello : unit -> unit
 ```
-```mdx-error
-Line 1, characters 1-21:
-Error: Value declarations are only allowed in signatures
-```
 
 Let's assume that accessing the `message` value directly is none of the others
 modules' business. We want to hide it by defining a restricted interface. This