Tweak exception Javadoc to be eclipse-clean

Bug: 469887
Change-Id: Ic189efc50d9c1f573dda0c79e5b0dad0813a5577
Signed-off-by: Jonathan Nieder <jrn@google.com>

org.eclipse.jgit/src/org/eclipse/jgit/errors/DiffInterruptedException.java

 		super(message);
 	}
 
+	/** Indicates that the thread computing a diff was interrupted. */
 	public DiffInterruptedException() {
 		super();
 	}

org.eclipse.jgit/src/org/eclipse/jgit/transport/resolver/ServiceNotAuthorizedException.java

  * the current user has not provided.
  * <p>
  * This corresponds to response code
- * {@link javax.servlet.http.HttpServletResponse#SC_UNAUTHORIZED}.
+ * {@code HttpServletResponse.SC_UNAUTHORIZED}.
  */
 public class ServiceNotAuthorizedException extends Exception {
 	private static final long serialVersionUID = 1L;
 		super(message);
 	}
 
+	/** Indicates that the requested service requires authentication. */
 	public ServiceNotAuthorizedException() {
 		super(JGitText.get().unauthorized);
 	}