refactor(docs) use $document and consistent css property spacing

This PR addresses two things:
- Fixes a spacing issue in line [130](https://github.com/sathify/angular.js/blob/d603be48702e5c791ee68ae83cecdf5a7cadabc9/docs/app/src/search.js#L130) & uses `$document[0]`  in line [136](https://github.com/sathify/angular.js/blob/d603be48702e5c791ee68ae83cecdf5a7cadabc9/docs/app/src/search.js#L136) to be consistent with line [134](https://github.com/sathify/angular.js/blob/d603be48702e5c791ee68ae83cecdf5a7cadabc9/docs/app/src/search.js#L134). Both diff in [this file](https://github.com/sathify/angular.js/compare/angular:master...sathify:fix-styles-typo?expand=1#diff-7cf20216c891e60c1e004397cf1dafa4R129).
- Adds a space after ':' in CSS property declarations where they don't exist for consistency and readability.

Please note: none of the CSS property has been altered in the PR so it does not change any style or look of the docs site. Simply makes it a little more consistent in property declarations. The docs CSS however is really messy and could use a larger refactor. I'm not sure about the priority and if there are any long term plans but I'm more than willing to help with it.