Small doc updates.

CONTRIBUTING.md

@@ -1,4 +1,4 @@
-# Contributing guidelines
+# Contribution guidelines
 
 So, you want to hack on the Istio mixer? Yay! Please refer to Istio's overall
 [contribution guidelines](https://github.com/istio/istio/blob/master/CONTRIBUTING.md)

README.md

@@ -24,8 +24,8 @@ for its consumers.
 - **Quota Management**. Enables services to allocate and free quota on a number of dimensions, Quotas are used as a relatively simple resource management 
 tool to provide some fairness between service consumers when contending for limited resources.
 
-Please see the main Istio [README](https://github.com/istio/istio/blob/master/README.md)
-file to learn about the overall Istio project and how to get in touch with us. To learn how you can
+Please see [istio.io](https://istio.io)
+to learn about the overall Istio project and how to get in touch with us. To learn how you can
 contribute to any of the Istio components, including the mixer, please 
 see the Istio [contribution guidelines](https://github.com/istio/istio/blob/master/CONTRIBUTING.md).
 

doc/dev/development.md

@@ -163,7 +163,7 @@ correctness, bugs, opportunities for improvement, documentation and comments,
 and style.
 
 Very small PRs are easy to review.  Very large PRs are very difficult to
-review. Github has a built-in code review tool, which is what most people use.
+review. GitHub has a built-in code review tool, which is what most people use.
 
 ### When to retain commits and when to squash