Update CONTRIBUTING.md (#216)

remove typos

Author: wseltzer

CONTRIBUTING.md

@@ -1,7 +1,6 @@
 # Digital Credentials: Federated Identity on the Web Working Group
 
-This repository is being used for work in the W3CFederated Identity on the Web Working Group, governed by the 
-governed by the [W3C Patent Policy](http://www.w3.org/Consortium/Patent-Policy-20040205/) and
+This repository is being used for work in the W3C Federated Identity on the Web Working Group, governed by the [W3C Patent Policy](http://www.w3.org/Consortium/Patent-Policy-20040205/) and
 [Spftware and Document License](https://www.w3.org/copyright/software-license-2023/). To contribute, you must 
 either participate in the relevant W3C Working Group or make a [non-member patent licensing
  commitment](https://www.w3.org/policies/process/#contributor-license).