Fixed Issue #510: typo in the test comment corrected.
diff --git a/LanguageFeatures/nnbd/static_errors_A13_t01.dart b/LanguageFeatures/nnbd/static_errors_A13_t01.dart
index f8735f5..95e2646 100644
--- a/LanguageFeatures/nnbd/static_errors_A13_t01.dart
+++ b/LanguageFeatures/nnbd/static_errors_A13_t01.dart
@@ -9,7 +9,7 @@
* Implementations that provide feedback about dead or unreachable code are
* encouraged to indicate that any arguments to the invocation are unreachable.
*
- * @description Check that it is тще an error to call a method, setter, or
+ * @description Check that it is not an error to call a method, setter, or
* getter on a receiver of static type Never (including via a null aware
* operator).
* @author sgrekhov@unipro.ru
