Fix link to Using $location in Developer Guide from $location reference

[b9chris]

No description provided.

[mary-poppins]

Thanks for the PR! Please check the items below to help us merge this faster. See the contributing docs for more information.

• Uses the issue template (#6946)

If you need to make changes to your pull request, you can update the commit with git commit --amend.
Then, update the pull request with git push -f.

Thanks again for your help!

[b9chris]

It's a simple doc fix of a broken link, no Issue required:

https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md

"Want a Doc fix?
If you're just making a small change, don't worry about filing an issue first. Use the friendly blue "Improve this doc" button at the top right of the doc page to fork the repository in-place and make a quick change on the fly."

[caitp]

Tanksverymuch