Update usage guidelines to reflect the donation to CNCF

logo/usage_guidelines.md

@@ -6,7 +6,8 @@ follow these basic guidelines.
 
 You may display, modify, or use the Kubernetes logo only in connection with
 compliant implementations of Kubernetes and related uses in the following ways.
-A compliant implementation is an implementation of the unmodified Google
+A compliant implementation is an implementation of the unmodified Cloud Native
+Compute Foundation (CNCF) 
 version of Kubernetes found at https://github.com/kubernetes/kubernetes and
 compatible branches thereof, together with published specifications, APIs and
 operational patterns.  Acceptable related uses include display, modification,
@@ -16,13 +17,10 @@ implementation, your Kubernetes-compatible product, or in collateral,
 presentations, and marketing materials relating to compliant implementations of
 Kubernetes.
 
-Use of the Kubernetes logo or other Google brands in ways not expressly covered
-by this document is not allowed without prior written consent from Google --
-see Google's [Guidelines for Third Party Use of Google Brand Features](http://www.google.com/intl/en/permissions/guidelines.html)
-for more information.
+All other uses of this logo are covered by the Linux Foundation trademark
+guidelines found [here](https://linuxfoundation.org/trademark-usage).
 
 ## Links to logo images
-
 Logo:
    * [SVG format](https://github.com/kubernetes/kubernetes/raw/master/logo/logo.svg)
    * [PNG format](https://github.com/kubernetes/kubernetes/raw/master/logo/logo.png)