Fix markup of doc comment

Author: polytypic

lib/picos_std.awaitable/picos_std_awaitable.mli

@@ -114,7 +114,7 @@ module Awaitable : sig
         it from the FIFO associated with the awaitable.
 
         ℹ️ If the associated trigger is used with only one awaiter and the
-        {!Trigger.await await} on the trigger returns [None], there is no need
+        {{!Trigger.await} await} on the trigger returns [None], there is no need
         to explicitly remove the awaiter, because it has already been removed.
     *)
   end