errors3 solution

rustlings-macros/info.toml

@@ -675,8 +675,8 @@ If other functions can return a `Result`, why shouldn't `main`? It's a fairly
 common convention to return something like `Result<(), ErrorType>` from your
 `main` function.
 
-The unit (`()`) type is there because nothing is really needed in terms of
-positive results."""
+The unit type `()` is there because nothing is really needed in terms of a
+positive result."""
 
 [[exercises]]
 name = "errors4"