attrib "key" -> "shortcut", also fix #20

doc/classes/Event.html

@@ -124,10 +124,10 @@
         The cursor left a widget, and a button was pressed.
         </li>
         <li><span class="parameter">PressStart</span>
-        A pointer button or accelerator key was pressed.
+        A pointer button or keyboard shortcut was pressed.
         </li>
         <li><span class="parameter">PressEnd</span>
-        A pointer button or accelerator key was released.
+        A pointer button or keyboard shortcut was released.
         </li>
         <li><span class="parameter">PressDrag</span>
         A pressed cursor moved; targets originating widget.

doc/modules/attribute.html

@@ -106,7 +106,7 @@ to recalculate their size and position.</p>
 	</tr>
 	<tr>
 	<td class="name" nowrap><a href="#key">key</a></td>
-	<td class="summary">Keyboard accelerator.</td>
+	<td class="summary">Keyboard shortcut.</td>
 	</tr>
 </table>
 <h2><a href="#Size_Attributes">Size Attributes </a></h2>
@@ -362,7 +362,7 @@ its scroll position when the widget's contents overflow its boundary.
     <strong>key</strong>
     </dt>
     <dd>
-    Keyboard accelerator. </p>
+    Keyboard shortcut. </p>
 
 <p>Should contain a string representing a key and optional modifiers,
 separated by dashes; for example <code>&apos;ctrl-c&apos;</code> or <code>&apos;alt-shift-escape&apos;</code>.</p>