Hotfix: Fix links - Contributing.md (#186)

docs/CONTRIBUTING.md

@@ -6,7 +6,7 @@ Firstly, if you are unsure or afraid of anything, just ask or submit the issue o
 
 However, for those individuals who want a bit more guidance on the best way to contribute to the project, read on. This document will cover all the points we're looking for in your contributions, raising your chances of quickly merging or addressing your contributions.
 
-Looking for a quickstart, get acquainted with our [Get Started](./docs/GetStarted.md) guide.
+Looking for a quickstart, get acquainted with our [Get Started](./GetStarted.md) guide.
 
 There are a few simple guidelines that you need to follow before providing your hacks. 
 
@@ -28,9 +28,9 @@ When raising issues, please specify the following:
 
 Provide PRs with appropriate tags for bug fixes or enhancements to the source code. Do follow the correct naming conventions and code styles when you work on and do try to implement all code reviews along the way.
 
-If you are looking for How to go about contributing and debugging the NNI source code, you can refer our [How to Contribute](./docs/HowToContribute.md) file in the `docs` folder.
+If you are looking for How to go about contributing and debugging the NNI source code, you can refer our [How to Contribute](./HowToContribute.md) file in the `docs` folder.
 
-Similarly for [writing trials](./docs/WriteYourTrial.md) or [starting experiments](StartExperiment.md). For everything else, refer [here](https://github.com/Microsoft/nni/tree/master/docs).
+Similarly for [writing trials](./WriteYourTrial.md) or [starting experiments](StartExperiment.md). For everything else, refer [here](https://github.com/Microsoft/nni/tree/master/docs).
 
 ## Solve Existing Issues
 Head over to [issues](https://github.com/Microsoft/nni/issues) to find issues where help is needed from contributors. You can find issues tagged with 'good-first-issue' or 'help-wanted' to contribute in.