Update CONTRIBUTING.md

Rewrote a few sentences.

Author: ziyadbasheer

CONTRIBUTING.md

@@ -4,11 +4,11 @@ Want to hack on kubernetes? Yay!
 
 ## Developer Guide
 
-We have a [Developer's Guide](docs/devel/README.md) that outlines everything you need to know from setting up your dev environment to how to get faster Pull Request reviews. And of course if you find something undocumented or incorrect along the way, feel free to send a PR!
+We have a [Developer's Guide](docs/devel/README.md) that outlines everything you need to know from setting up your dev environment to how to get faster Pull Request reviews. If you find something undocumented or incorrect along the way, please feel free to send a Pull Request.
 
 ## Filing issues
 
-If you have a question about Kubernetes or have a problem using Kubernetes, before filing an issue, please read the [troubleshooting guide](docs/troubleshooting.md).
+If you have a question about Kubernetes or have a problem using it, please read the [troubleshooting guide](docs/troubleshooting.md) before filing an issue.
 
 ## How to become a contributor and submit your own code