RFR: 8176040 Documentation of java.awt.Rectangle.add(java.awt.Point) is wrong.

[Alexander Zuev]

Hello!

  Please review fix for the jdk/client.
Bug: https://bugs.openjdk.java.net/browse/JDK-8176040
Fix: http://cr.openjdk.java.net/~kizune/8176040/webrev 
<http://cr.openjdk.java.net/~kizune/8176040/webrev/>

Fix is trivial, i just changed the JavaDoc of two methods of 
java.awt.Rectangle that previously referenced
non-existing method of the same class. One day it had to be done i guess.

/Alex