Update ttml-imsc1-errata.html

spec/ttml-imsc1-errata.html

@@ -273,7 +273,7 @@ <h1 class="title p-name" id="title" property="dcterms:title">IMSC 1
         <dd><a href="http://www.w3.org/TR/ttml-imsc1/">http://www.w3.org/TR/ttml-imsc1/</a></dd>
       </dl>
       <p class="copyright"> <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a>
-        © 2016 <a href="http://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup>
+        © 2016 <a href="http://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup>
         (<a href="http://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>,
         <a href="http://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>,
         <a href="http://www.keio.ac.jp/">Keio</a>, <a href="http://ev.buaa.edu.cn/">Beihang</a>).
@@ -355,7 +355,7 @@ <h2>Acknowledgments (Non-Normative)</h2>
         <p>The editor wishes to especially acknowledge the following
           contributions by members: Glenn Adams, Skynav; John Birch, Invited
           expert; Mike Dolan, Invited expert; Nigel Megitt, British Broadcasting
-          Corporation; Thierry Michel, W3C; Andreas Tai, Institut für
+          Corporation; Thierry Michel, W3C; Andreas Tai, Institut für
           Rundfunktechnik.</p>
         <p>The editor also wishes to acknowledge Digital Entertainment Content
           Ecosystem (DECE) for contributing to the initial document for the