chore: tidy up document

Author: marcoscaceres

index.html

@@ -279,10 +279,10 @@ <h2>
             <li>If |document| is not [=Document/fully active=], return [=a
             promise rejected with=] a {{"InvalidStateError"}} {{DOMException}}.
             </li>
-            <li>If |document|'s [=relevant settings object=]'s [=origin=] is not
-            [=same origin-domain=] with [=this=]'s [=relevant settings object=]'s
-            [=environment/top-level origin=], return [=a promise rejected
-            with=] a {{"SecurityError"}} {{DOMException}}.
+            <li>If |document|'s [=relevant settings object=]'s [=origin=] is
+            not [=same origin-domain=] with [=this=]'s [=relevant settings
+            object=]'s [=environment/top-level origin=], return [=a promise
+            rejected with=] a {{"SecurityError"}} {{DOMException}}.
             </li>
           </ol>
         </li>