Lots of really minor changes:

Lots of really minor changes:
- Wrap paragraphs more consistently.
- Make this well-formed XML.
- When making a hyperlink to a function description, consistently
  place the anchor inside the code, not the other way around.
- Make more references to function names hyperlinks to the
  descriptions.
- Fix a few small typos.
- Don't always use an extra div to carry a class attribute, just stick
  it on the pre.