Normalized exercise output, answers (#41)

1. All exercises should print a trailing \n
2. The build script should always show you _exactly_ what it's looking
   for when you get it wrong. Therefore, .output should be set to the
   exact expected output.

exercises/022_errors2.zig

@@ -25,5 +25,5 @@ pub fn main() void {
     // an error. Can you set the type correctly above?
     my_number = MyNumberError.TooSmall;
 
-    std.debug.print("I compiled!", .{});
+    std.debug.print("I compiled!\n", .{});
 }