docs: update metadata mapping

metadata-mapping/src/test/java/com/iluwatar/metamapping/AppTest.java

@@ -33,7 +33,6 @@ import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 class AppTest {
   /**
    * Issue: Add at least one assertion to this test case.
-   *
    * Solution: Inserted assertion to check whether the execution of the main method in {@link App#main(String[])}
    * throws an exception.
    */