fix webrtc copyright (w3c#1880)

lib/copyright-exceptions.json

@@ -17,7 +17,7 @@
  },
  {
  "specShortnames": ["webrtc"],
- "copyright": "Initial Author of this Specification was Ian Hickson, Google Inc., with the following copyright statement:<br> © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera Software ASA. You are granted a license to use, reproduce and create derivative works of this document. All subsequent changes since 26 July 2011 done by the W3C WebRTC Working Group are under the following <a href=\"https://www.w3.org/policies/#copyright\">Copyright</a>:<br> <a href=\"https://www.w3.org/policies/#copyright\">Copyright</a> © 2011-@YEAR <a href=\"https://www.w3.org/\">World Wide Web Consortium</a>. <abbr title=\"World Wide Web Consortium\">W3C</abbr><sup>®</sup> <a href=\"https://www.w3.org/policies/#Legal_Disclaimer\">liability</a>, <a href=\"https://www.w3.org/policies/#W3C_Trademarks\">trademark</a> and <a href=\"https://www.w3.org/copyright/document-license/\">document use</a> rules apply."
+ "copyright": "Initial Author of this Specification was Ian Hickson, Google Inc., with the following copyright statement:<br> © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera Software ASA. You are granted a license to use, reproduce and create derivative works of this document. All subsequent changes since 26 July 2011 done by the W3C WebRTC Working Group are under the following <a href=\"https://www.w3.org/policies/#copyright\">Copyright</a>:<br> <a href=\"https://www.w3.org/policies/#copyright\">Copyright</a> © 2011-@YEAR <a href=\"https://www.w3.org/\">World Wide Web Consortium</a>. <abbr title=\"World Wide Web Consortium\">W3C</abbr><sup>®</sup> <a href=\"https://www.w3.org/policies/#Legal_Disclaimer\">liability</a>, <a href=\"https://www.w3.org/policies/#W3C_Trademarks\">trademark</a> and <a href=\"https://www.w3.org/copyright/software-license/\">permissive document license</a> rules apply."
  },
  {
  "specShortnames": ["security-privacy-questionnaire"],