fix(html): use 'start' attribute when parsing ordered lists from HTML docs (#1062)

* fix(html): use 'start' attribute in ordered lists

When parsing ordered lists in HTML, take into account the 'start' attribute if it exists.

Signed-off-by: Cesar Berrospi Ramis <75900930+ceberam@users.noreply.github.com>

* chore(html): reduce verbosity in HTML backend

Signed-off-by: Cesar Berrospi Ramis <75900930+ceberam@users.noreply.github.com>

---------

Signed-off-by: Cesar Berrospi Ramis <75900930+ceberam@users.noreply.github.com>