Add content to Delphi Versions doc & format it

Correct HTML structure & format HTML.

Set column widths: This avoids word wrapping in narrow column that
specifies the Delphi version.

Styled right hand column of table.

Add Namespaces & Unit scope name entries. Included x-ref links between
the two entries and links to explanation on Embarcadero DocWiki.

Convert footnote references to superscript

Author: delphidabbler