docs: IAB formatting fixes (no content changes)

Saw a problem with the files' TOCs that was causing formatting
problems. While I had the files open, I fixed other formatting
issues--mostly just whitespace (paragraphs that were on one line
instead of broken at 100 chars) and a couple of other typos or HTML
errors. No substantive changes to the documentation.

Change-Id: I5f89ae616489d19dd683fd24e11e3482cce99477