Specify that "throw" aborts processing

Also removes two superfluous "abort these steps".

Fixes #1856

webrtc.html

@@ -102,6 +102,9 @@ <h2>Terminology</h2>
     <dfn data-dfn-for="exception" data-cite=
     "!WEBIDL-1#dfn-create-exception">create</dfn> are
     defined in [[!WEBIDL-1]].</p>
+    <p>The term "throw" is used as specified in [[INFRA]]: it terminates
+      the current processing steps.
+    </p>
     <p>The terms <dfn data-lt="fulfill|fulfillment">fulfilled</dfn>, <dfn
     data-lt="reject|rejection|rejecting">rejected</dfn>, <dfn data-lt=
     "resolve|resolves">resolved</dfn>, <dfn>pending</dfn> and
@@ -2004,8 +2007,7 @@ <h4>Set the configuration</h4>
                       <code>"password"</code>, and
                       <code><var>server</var>.credential</code> is not a
                       <span class="idlMemberType"><a>DOMString</a></span>, then
-                      <a>throw</a> an <code>InvalidAccessError</code> and abort these
-                      steps.</p>
+                      <a>throw</a> an <code>InvalidAccessError</code>.</p>
                     </li>
                     <li>
                       <p>If <var>scheme name</var> is <code>turn</code> or
@@ -2014,8 +2016,7 @@ <h4>Set the configuration</h4>
                       <code>"oauth"</code>, and
                       <code><var>server</var>.credential</code> is not an
                       <a>RTCOAuthCredential</a>, then throw an
-                      <code>InvalidAccessError</code> and abort these
-                      steps.</p>
+                      <code>InvalidAccessError</code>.</p>
                     </li>
                   </ol>
                 </li>