article on index() - index() with no arg now implicitly calls first() not last from jQuery 1.91

[trystanclarke]

Hi, I just noticed this while trying out the code snippets on jsFiddle - it seems that .index() returns the index of the first item not the last item as of jQuery 1.91. If you run the snippet using 1.83 it uses the last one.

This is on the page at http://learn.jquery.com/using-jquery-core/understanding-index/

[dmethvin]

The docs are wrong here. Before this fix the method didn't return consistent results, now it does. we just need to remove that note and add one that before 1.9 you should ensure that the .index() method is only passed one element or the results may be incorrect.

[arthurvr]

However 54946db fixed the examples, adding a note on the bug might still be welcome. If you don't know about the issue, the examples are now even more confusing. I'il open a PR this afternoon.