[10] RFR (XS) 8185843: fix broken HotSpotInternals wiki links

[Muthusamy Chinnathambi]

Hi,

Please review this trivial change for the fix of bug 'JDK-8185843 fix broken HotSpotInternals wiki links'

Summary:
The old "wikis.oracle.com" links are no longer accessible as they are moved to "wiki.openjdk.java.net". Some code comments and README files still point to the old URLs and this change is to fix those broken links.

jdk10 bug: https://bugs.openjdk.java.net/browse/JDK-8185843
webrev link: http://cr.openjdk.java.net/~shshahma/Muthu/8185843/webrev.00/

Testing: ran jprt

Regards,
Muthusamy C