Wiki: Dispatch Order is Not Explained Correctly

There seems to be an error in the [Dispatch Order](https://github.com/google/guice/wiki/ServletModule#dispatch-order) section of the wiki.

It says:
> This will traverse down the list of rules in lexical order. For example, a url /my/file.js will first be compared against the servlet mapping.

Which is incorrect. Right before that it says:

>They will be compared and dispatched in the order in which the rules appear in your ServletModule

which is correct.