Correct element click actions list (#1779)

* Correct element click actions list

element click is erroneously defined as `«pointer move action, pointer down action, pointer move action».` but should obviously be `«pointer move action, pointer down action, pointer up action».` making use of the pointer up action defined

* Correct element click pointer up action's id

The pointer id of pointer up action should be "pointer" to match the pointer move and pointer down actions pointer ids

index.html

@@ -5919,13 +5919,13 @@ <h4><dfn>Element Click</dfn></h4>
 
      <li><p>Let <var>pointer up action</var> be an <a>action
       object</a> constructed with arguments <var>input id</var>,
-      "<code>mouse</code>", and "<code>pointerUp</code>" as arguments.
+      "<code>pointer</code>", and "<code>pointerUp</code>" as arguments.
 
      <li><p><a>Set a property</a> <code>button</code>
       to <code>0</code> on <var>pointer up action</var>.
 
      <li><p>Let <var>actions</var> be the list «<var>pointer move
-     action</var>, <var>pointer down action</var>, <var>pointer move
+     action</var>, <var>pointer down action</var>, <var>pointer up
      action</var>».
 
      <li><p><a>Dispatch a list of actions</a> with <var>input