fix typo

CONTRIBUTING.md

@@ -42,7 +42,7 @@ If you don't see your idea listed, and you think it can contribute to Komodo, do
 * **If your contribution is major,** such as a new feature or bugfix, start by opening an issue first. That way, other contributors can weigh in on the discussion before you do any work.
 
 ## Style guide
-Write clear, clean and consistent code. Follow well-known and established style guidelines like [Google C++ Style Guide](https://google.github.io/styleguide/cppguide.html) or [Bjarne Stroustrup C++ Style FAQ](http://www.stroustrup.com/bs_faq2.html).
+Write clear, clean and consistent code. Follow well-known and established style guidelines like [Google's C++ Style Guide](https://google.github.io/styleguide/cppguide.html) or [Bjarne Stroustrup's C++ Style FAQ](http://www.stroustrup.com/bs_faq2.html).
 
 ## Setting up your environment