RFR: 8208484: color contrast issues in javadoc

[Priya Lakshmi Muthuswamy]

Hi,

Kindly review fix for https://bugs.openjdk.java.net/browse/JDK-8208484
webrev : http://cr.openjdk.java.net/~pmuthuswamy/8208484/webrev.00/

Have set a slightly lighter shade to background and darker shade for 
foreground.
This change is similar to https://bugs.openjdk.java.net/browse/JDK-8199893.

org screenshot:(/specs/pack-spec.html)


screenshot with changes:


Thanks,
Priya