Correct English errors
Correct syntax error:  backslashes should have been slashes.
Also add brief explanation of obscure "^" character.
Explain why one would use sectlinks
Clarify that an example works but is not the recommended style.
Make text consistent with example.
The Gettysburg Address was given two different titles:
 * Soldiers' National Cemetery Dedication
 * Dedication of the Soldiers' National Cemetery
This commit makes them consistent.
If we aren't going to call it the "Gettysburg Address", then we might as well
use Abraham Lincoln's preferred title, from the authoritative Bliss text:
"Address delivered at the dedication of the Cemetery at Gettysburg"