Fix anchor link to Style guide section

Upon clicking the anchor link, the user will be directed to the appropriate section.

Author: adyavanapalli

CONTRIBUTING.md

@@ -13,7 +13,7 @@ We've put together the following guidelines to help you figure out where you can
 0. [Types of contributions we're looking for](#types-of-contributions-were-looking-for)
 0. [Ground rules & expectations](#ground-rules--expectations)
 0. [How to contribute](#how-to-contribute)
-0. [Style guide](#style--guide)
+0. [Style guide](#style-guide)
 0. [Setting up your environment](#setting-up-your-environment)
 0. [Contribution review process](#contribution-review-process)
 0. [Community](#community)