Please review these minor changes to make the doc comments HTML5 compliant.
Mostly, the changes are about changing <tt> to <code> or {@code} tags.
There is one minor adjustment to the text content -- in TreeVisitor.java,
I adjusted the name visitXYZ to visitXyz in line with similar usage
elsewhere.
JBS: https://bugs.openjdk.java.net/browse/JDK-8179304 Webrev: http://cr.openjdk.java.net/~jjg/8179304/webrev/ -- Jon
