RFR: {@docRoot} reference need to be updated to reflect new module structure

[Jonathan Gibbons]

This is fixing up some links in the java.base module, following a recent 
change
in javadoc to the organization of the generated files. While the change 
was mostly
transparent, links within the documentation using {@docRoot} need to be 
updated.

All the changes were done automatically, by the following sed commands, 
to insert
"/java.base" into the affected links.

's|{@docRoot}/java/lang/|{@docRoot}/java.base/java/lang/|'
's|{@docRoot}/java/util/|{@docRoot}/java.base/java/util/|'

JBS: https://bugs.openjdk.java.net/browse/JDK-8199465
Webrev: http://cr.openjdk.java.net/~jjg/8199465/webrev.00/

There are a few additional issues in other modules that I will handle 
separately.

-- Jon