message: fixed small textual error
diff: ///
  /// This macro should be invoced in a global scope, and the argument to the macro
  /// should be the name of a rust module that is imported in the invocation scope.
  -/// The module should export four functions with the following signatures:
  +/// The module should export three functions with the following signatures:
  /// ```
  /// # use cosmwasm_std::{
  /// # Storage, Api, Querier, Extern, Env, StdResult, Binary,
  /// # InitResult, HandleResult, QueryResult,
  /// # };
  -///
  +/// #
  /// # type InitMsg = ();
  /// pub fn init<S: Storage, A: Api, Q: Querier>(
  /// deps: &mut Extern<S, A, Q>,
  