restore FAQ H2 and links

[wibeasley]

something must have changed with GFM's interpretation . The FAQ H2 headers were being treated as an ordinary numbered list. The FAQ hyperlinks from the TOC weren't working either.

I made the FAQ more consistent with the Examples.

The link for FAQ 6 doesn't seem to work, but the others do. Not sure why; the labels are exactly the same (ie, faq-6-why-are-there-problems-when-we-use-table-names-or-column-name).