RFR: JDK-8228547: accessibility errors in jvmti.html

[Alex Menkov]

Hi all,

Please review the change that fixes accessibility issues in generated 
jvmti.html

There are 2 "general" accessibility issues ("content outside of a 
region") - fixed by replacing <div role="banner"> with <header> and <div 
role="main"> with <main>
and huge number (5200+) of table issues:
- no row or column header for cells;
- table has only one column or row.
Most of the tables was updated to have row and column headers,
the tables which does not contain table data (like "Phase/Callback 
Safe/Position/Since" block for functions) were converted to use <div>s.
All table headers/descriptions were converted to <caption>.
All cases when tables can has only one row/column are handled by xsl (if 
there is no data for the table, <div>s are used).

jira: https://bugs.openjdk.java.net/browse/JDK-8228547

webrev: 
http://cr.openjdk.java.net/~amenkov/jdk14/jvmti_html_accessibility/webrev/

generated doc:
- old: 
http://cr.openjdk.java.net/~amenkov/jdk14/jvmti_html_accessibility/0/jvmti.html
- new: 
http://cr.openjdk.java.net/~amenkov/jdk14/jvmti_html_accessibility/1/jvmti.html

Visually there are minimal changes (checked in Firefox, Chrome, IE)

specdiff: 
http://cr.openjdk.java.net/~amenkov/jdk14/jvmti_html_accessibility/spectdiff/diff.html

--alex