Ran the page through the validator and made it a little more compliant.
Also added a small amount of additional info.

Kent
Cleaned up some of the wording a bit and uncommented some hidden examples.
No reason to hide these.  I think they are good info.  Will probably
uncomment more in the future... :)

Kent
Fixed a typo and added a note.

Kent
DGD now also supports incremental snapshots.
Merge remote-tracking branch 'upstream/master'
Clean up the head section
Fix vertical padding around headings
Make indentation of headings consistent
Remove spurious whitespace at ends of headings
Clean up anchors in headings
This should be a closer, not an opener
Fix vertical padding around paragraphs
Fix indentation of pre tags
Trim whitespace from end of lines
These were meant to be separate paragraphs, so mark them as such
Clean up table markup a tad
Fix a typo
Clean up a pre block