Fix typo

Author: xhwang-chromium

encrypted-media-respec.html

@@ -3117,7 +3117,7 @@ <h2>
             </p>
             <p>
               For [=Key Systems=] that use such certificates, applications SHOULD call
-              {{MediaKeySession/setServerCertificate()}} to explicit set the server certificate.
+              {{MediaKeys/setServerCertificate()}} to explicit set the server certificate.
               Otherwise, license exchange may fail.
             </p>
             <p class="note">