RFR: 8194651: javadoc: mark the com.sun.javadoc API for removal

[Kumar Srinivasan]

Hi,

Please review fix for 8194651, 
https://bugs.openjdk.java.net/browse/JDK-8194651
Webrev: http://cr.openjdk.java.net/~ksrini/8194651/webrev.01/
Please note this is blocked by: JDK-8194764

Thanks
Kumar