HHH-7029 - prependListeners changed to appendListeners in chapter 7.9.1....

[Kamii]

Title: Javadoc says the opposite as in code example
Link: https://hibernate.onjira.com/browse/HHH-7029

The last line of the example in chapter 7.9.1 (devguide) is wrong. The comment is saying the listener should be added at the end, but the code is adding it at the first.

I have changed the prependListners to appendListeners in the example.

[brmeyer]

Thanks @Kamii . Feel free to make these all in one PR. Especially if you're making Doc changes, you don't have to do a new branch each time.

[Kamii]

In the future i will make all doc changes in one PR.