Edit "top issues" checklist:
- Add illustration of "Sentence case" vs. "Title Case".
- Add note about capitalizing the first word of a subtitle.
- Add clarification about checking that keywords match: editors will check
the S&P web site; authors only need to check the PDF and document keywords.
- Simplify the items about keywords and abstract to remove references to the
S&P webpage.
- Put the editors-only comments into html comments.

Note: I've used the comment format <!--- --> (with in initial triple dash),
because apparently some systems will interpret this as a "real" comment and
remove it completely from the html output. But I'm making sure not to put
anything in these comments that would be inappropriate for authors to see
if they view the html source.
- Minor formatting.
- Minor change to comment about subtiles.
- Change comments to standard html comments (no triple dash) to match
comments elsewhere in document.
- Add that n-dash may be used for affixes in addition to number ranges.