improve use of <section> in generated docs

We can/should improve the use of <section> tags within generated documentation.

Two closely-related aspects are noted here:

1. Currently, all existing uses of <section> do not identify a "class" attribute. They are all of the simple form '<section role="region">'
Specifying a class would allow the ability to use styling for the section.

2. Certain uses of <div> would be better replaced by <section>.
On the page for a class declaration, this specifically includes the <div> tags with the class of "description", "summary", "details".

3. On a class declaration page, it might be reasonable to include the inheritance section in a new section. Currently, the top level structure of a class declaration is

:div[contentContainer]
    ul[inheritance]
    div[description]
    div[summary]
    div[details]


See https://www.w3.org/TR/2011/WD-html5-20110525/sections.html#the-section-element

Note that changing <div> to <section> may require corresponding changes to the standard stylesheet.