Change "hugodocs" to "hugoDocs" to match GitHub's default URL

CONTRIBUTING.md

@@ -7,7 +7,7 @@ helping to manage issues, etc.
 
 The Hugo community and maintainers are [very active](https://github.com/gohugoio/hugo/pulse/monthly) and helpful, and the project benefits greatly from this activity. We created a [step by step guide](https://gohugo.io/tutorials/how-to-contribute-to-hugo/) if you're unfamiliar with GitHub or contributing to open source projects in general.
 
-*Note that this repository only contains the actual source code of Hugo. For **only** documentation-related pull requests / issues please refer to the [hugoDocs](https://github.com/gohugoio/hugodocs) repository.*
+*Note that this repository only contains the actual source code of Hugo. For **only** documentation-related pull requests / issues please refer to the [hugoDocs](https://github.com/gohugoio/hugoDocs) repository.*
 
 *Pull requests that contain changes on the code base **and** related documentation, e.g. for a new feature, shall remain a single, atomic one.*