Specs: fix a raft of syntax errors caught by actually running a syntax checker...

sky/specs/pointer.md

 Pointer Events
 ==============
 
 Scope
 -----
 
 The following input devices are supported by sky:
  - fingers on multitouch screens
  - mice, including mouse wheels
  - styluses on screens
@@ skipping 416 matching lines @@
 
 class PointerUpEvent extends PointerEvent<Null> {
   PointerUpEvent = PointerEvent;
   bool get bubbles => false;
 }
 
 class PointerMovedEvent extends PointerEvent<Null> {
   PointerMovedEvent = PointerEvent;
   bool get bubbles => false;
 }
+/*
 ```
 
 Wheel events
 ------------
 
 When a wheel input device is turned, a ``WheelEvent`` event that
 doesn't bubble is fired at the application's element tree's root node,
 with the following fields:
 
            wheel: an integer assigned to this wheel by the system. The
@@ skipping 16 matching lines @@
                x: x-position relative to the top-left corner of the
                   display, in global layout coordinates
 
                y: x-position relative to the top-left corner of the
                   display, in global layout coordinates
 
 Note: The only wheels that are supported are mouse wheels and physical
 dials. Track balls are not reported as mouse wheels.
 
 ```dart
+*/
 class WheelEvent extends Event {
-  Event({ this.wheel,
-          this.delta: 0.0,
-          this.pointer,
-          this.x, this.y,
-        }): super();
+  WheelEvent({ this.wheel,
+               this.delta: 0.0,
+               this.pointer,
+               this.x, this.y
+             }): super();
 
   final int wheel;
   final double delta; // revolutions (or fractions thereof)
   final int pointer;
   final double x; // logical pixels
   final double y; // logical pixels
 
   bool get bubbles => false;
 }
 ```