RFR: JDK-8241544 update stylesheet for *-page CSS class rename and hyphenated naming

Tue Mar 24 22:45:10 UTC 2020

Please review some simple fixes to the stylesheet to address some issues 
caused by a couple of recent changes: (1) to use "-page" as a suffix for 
the CSS class name for <body> elements, and (2) for the change to 
hyphenated naming.

A significant new test case is added to the existing TestStylesheet.java 
class. The test determines the set of known CSS class names, based on 
the CSS class names defined in the stylesheet, and a set of known 
additional class names, and then reads the output generated from a small 
sample API, and verifies that the values of all the "class" attributes 
are in set of known CSS class names.

A copy of the API documentation is provided.  The primary kind of page 
to check is a regular type declaration page, such as for java.lang.Object.

-- Jon

JBS: https://bugs.openjdk.java.net/browse/JDK-8241544
Webrev: http://cr.openjdk.java.net/~jjg/8241544/webrev.00/index.html
API: http://cr.openjdk.java.net/~jjg/8241544/api.00/index.html