Update 02.3.md

Author: daffaz

en/02.3.md

@@ -193,7 +193,7 @@ Use the `func` keyword to define a function.
 func funcName(input1 type1, input2 type2) (output1 type1, output2 type2) {
  // function body
  // multi-value return
- return value1, value2
+ return output1, output2
 }
 ```
 We can extrapolate the following information from the example above.