[alreq] Proper tags for titles: H2 or H3?

mostafah has just created a new issue for 
https://github.com/w3c/alreq:

== Proper tags for titles: H2 or H3? ==
Related to our recent cleanup changes to the document, I noticed that 
we are not consistent about the HTML tags for titles.

Most of the document uses `h2` for all levels of headers, depending on
 nested `section`s for building hierarchy, but we also have some `h3`s
 in similar situations.

Is this something that we should care about? And if so, what is the 
suggested solution? I can send a PR if we have a policy for this.

See https://github.com/w3c/alreq/issues/69
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