Replace usage of "responsible document"

Author: jan-ivar

actions/index.html

@@ -126,9 +126,8 @@ <h4>Registering and responding to capture actions</h4>
               <p>When this method is invoked, the user agent MUST run the following steps:</p>
               <ol>
                 <li>
-                  If the [=relevant settings object=]'s
-                  [=environment settings object/responsible document=] is either not
-                  [=Document/fully active=] or its [=browsing context=] is not a
+                  If the [=relevant global object=]'s [=associated `Document`=] is
+                  either not [=Document/fully active=] or its [=browsing context=] is not a
                   [=top-level browsing context=], then throw {{InvalidAccessError}}.
                 </li>
                 <li>
@@ -291,8 +290,8 @@ <h4>Enumerating supported actions and triggering them</h4>
                       </p>
                       <ol>
                         <li>
-                          Let |target| be the the [=relevant settings object=]'s
-                          [=environment settings object/responsible document=]'s
+                          Let |target| be the the [=relevant global object=]'s
+                          [=associated `Document`=]'s
                           associated navigator's {{MediaDevices}} object.
                         <li>
                           If |action| is not in |target|'s