Index the JDK in summary mode (omit bodies).
Improve first line detection.

Also fixed an issue with leading blank lines in doc formatting. The JDK classes
have a bad habit of containing docs like this:

/**
 * <p>Hey guys, let's start with a paragraph, because of course that's not
 * implied, and I know you LOVE LOVE LOVE to see HTML tags in your docs!</p>
 * <p>Blah blah blah...</p>
 */

This previously resulted in '\n' getting turned into ' ' which was then used to
start the implicit first paragraph, and then a blank line was added and then
the contents of the <p>. It was a mess! Now it's better.
Some hackery for @docRoot. Blah.