Wording improvements for String.indexOf, String.lastIndexOf

[Martin Buchholz]

Hi Alan, Xueming,

I'd like you to do a code review.

http://cr.openjdk.java.net/~martin/webrevs/openjdk7/lastIndexOf2/

A colleague suggested wording improvements for String.indexOf and
String.lastIndexOf
At least, this makes the javadoc less gratuitously inconsistent.

Since I'm already coincidentally fixing lastIndexOf, I can either fold
this patch into
lastIndexOf or you can file a separate bug - your choice.

Thanks,

Martin