Fixed a typo

core-java-modules/core-java-jvm-2/src/test/java/com/baeldung/memlayout/MemoryLayoutUnitTest.java

@@ -91,7 +91,7 @@ public class MemoryLayoutUnitTest {
         private boolean first;
         private char second;
         private double third;
-        private int forth;
+        private int fourth;
         private boolean fifth;
     }