message: docs: fix bad return value comment
diff: @@ -286,7 +286,7 @@ MyMockContract.smocked.myFunction.will.return.with(() => {
  return 'Some return value!'
  })
  -console.log(await MyMockContract.myFunction()) // ['Some return value!']
  +console.log(await MyMockContract.myFunction()) // 'Some return value!'
  ```
  ### Returning a Function (w/ Arguments)
  @@ -304,7 +304,7 @@ MyMockContract.smocked.myFunction.will.return.with((myFunctionArgument: string)
  return myFunctionArgument
  })
  -console.log(await MyMockContract.myFunction('Some return value!')) // ['Some return value!']
  +console.log(await MyMockContract.myFunction('Some return value!')) // 'Some return value!'
  ```
  ### Reverting (w/o Data)
  