Fix inconsistency in javadoc for WorkflowInterface (#2232)

Author: Adam Mackler

temporal-sdk/src/main/java/io/temporal/workflow/WorkflowInterface.java

@@ -84,7 +84,7 @@
  *     String d();
  *  }
  *
- *  public class CImpl implements C {
+ *  public class DImpl implements D {
  *      public void a() {}
  *      public void aa() {}
  *      public void b() {}
@@ -93,7 +93,7 @@
  *  }
  * </code></pre>
  *
- * When <code>CImpl</code> instance is registered with the {@link io.temporal.worker.Worker} the
+ * When <code>DImpl</code> instance is registered with the {@link io.temporal.worker.Worker} the
  * following is registered:
  *
  * <p>
@@ -107,7 +107,7 @@
  * </ul>
  *
  * The client code can call signals through stubs to <code>B</code>, <code>C</code> and <code>D
- * </code> interfaces. A call to crate a stub to <code>A</code> interface will fail as <code>A
+ * </code> interfaces. A call to create a stub to <code>A</code> interface will fail as <code>A
  * </code> is not annotated with the WorkflowInterface.
  */
 @Retention(RetentionPolicy.RUNTIME)