Some minor wording fixes

Author: chrisn

encrypted-media-respec.html

@@ -1294,7 +1294,7 @@ 
                 configurations for which consent has been denied during the execution of this
                 algorithm or based on persisted consent information for the origin. It is used to
                 determine whether user consent for a candidate configuration or accumulated
-                configuration has been denied. Consent is denied for a accumulated configuration if
+                configuration has been denied. Consent is denied for an accumulated configuration if
                 every derived configuration has already been denied. Internal representation of
                 <var>restrictionsvar> is implementation-specific.
               p>
@@ -1998,7 +1998,7 @@ 
                   li>
                   <li>
                     <p>
-                      If <var>content typevar> is not strictly a <var>audio/video typevar>,
+                      If <var>content typevar> is not strictly an <var>audio/video typevar>,
                       continue to the next iteration.
                     p>
                     <p class="note">