RFR:8211957 : Broken links to stylesheet in java.base/doc-files

[Priya Lakshmi Muthuswamy]

Hi,

Kindly review trivial fix for 
https://bugs.openjdk.java.net/browse/JDK-8211957
webrev : http://cr.openjdk.java.net/~pmuthuswamy/8211957/webrev.00/
Thanks,
Priya