Glob documentation for example .jshintignore

I had some difficulty figuring out the glob syntax for JSHint, since the original documentation referenced in https://groups.google.com/forum/#!topic/jshint/62N12QUhBCs no longer exists on the current JSHint. Adding it to this example in the hopes that it will be helpful.
Merge pull request #1553 from christopherliu/patch-1

Glob documentation for example .jshintignore