Fix for 2 (tiny) typos in chapter 9

This fixes 2 very tiny typos.

When talking about monkeys eventually typing out "to be or not to be," and how it's a silly example, the example sketch has 2 problems:

1. the java class String was lower-cased: `string s = "...";`
2. the sentence, which was supposed to only have lower-case letters and spaces, started with a capital T

This fixes both of those.