Update license files to match latest model

Author: dontcallmedom

CONTRIBUTING.md

@@ -1,11 +1,9 @@
-# Web Real-Time Communications Working Group
-
 Contributions to this repository are intended to become part of Recommendation-track documents governed by the
-[W3C Patent Policy](https://www.w3.org/Consortium/Patent-Policy-20040205/) and
+[W3C Patent Policy](https://www.w3.org/Consortium/Patent-Policy/) and
 [Software and Document License](https://www.w3.org/Consortium/Legal/copyright-software). To make substantive contributions to specifications, you must either participate
 in the relevant W3C Working Group or make a non-member patent licensing commitment.
 
-If you are not the sole contributor to a contribution (pull request), please identify all 
+If you are not the sole contributor to a contribution (pull request), please identify all
 contributors in the pull request comment.
 
 To add a contributor (other than yourself, that's automatic), mark them one per line as follows:
@@ -20,5 +18,5 @@ If you added a contributor by mistake, you can remove them in a comment with:
 -@github_username
 ```
 
-If you are making a pull request on behalf of someone else but you had no part in designing the 
+If you are making a pull request on behalf of someone else but you had no part in designing the
 feature, you can remove yourself with the above syntax.