Need reviewer: minor fixes to javadoc comments for openjdk6

[Kelly O'Hair]

Same change for openjdk6 as this one in openjdk7:
http://hg.openjdk.java.net/jdk7/build/jdk/rev/820b4e843d51

6967036: Need to fix links with // in Javadoc comments
http://cr.openjdk.java.net/~ohair/openjdk6/openjdk6-javadoc/webrev/

Not exactly sure this is necessary, but the patch applies cleanly, is correct, and seems like the
right thing to do in case javadocs are ever created from these sources.

-kto