Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -19,10 +19,10 @@ Follow either of the two links above to access the appropriate CLA and instructi
 
 If you're new to the project and want to help, but don't know where to start, we have a semi-curated list of issues that should not need deep knowledge of the system. [Have a look and see if anything sounds interesting](https://github.com/kubernetes/ingress/issues?utf8=%E2%9C%93&q=is%3Aopen%20is%3Aissue%20label%3A%22help+wanted%22). Alternatively, read some of the docs on other controllers and try to write your own, file and fix any/all issues that come up, including gaps in documentation!
 
-## Contributing A Patch
+## Contributing a Patch
 
 1. If you haven't already done so, sign a Contributor License Agreement (see details above).
-1. Read the [Ingress development guide](docs/dev/README.md)
+1. Read the [Ingress development guide](docs/dev/README.md).
 1. Fork the desired repo, develop and test your code changes.
 1. Submit a pull request.