help text for parameters adapted

build.zig

@@ -654,7 +654,7 @@ const ZiglingStep = struct {
             }
 
             print("\n{s}Edit exercises/{s} and run this again.{s}", .{ red_text, self.exercise.main_file, reset_text });
-            print("\n{s}To continue from this zigling, use this command:{s}\n    {s}zig build {s}{s}\n", .{ red_text, reset_text, bold_text, self.exercise.key(), reset_text });
+            print("\n{s}To continue from this zigling, use this command:{s}\n    {s}zig build -Dn={s}{s}\n", .{ red_text, reset_text, bold_text, self.exercise.key(), reset_text });
             std.os.exit(1);
         };
     }