[css-animations-2] Fixed Changes section and added links (w3c#8498)

Author: SebastianZ

css-animations-2/Overview.bs

@@ -823,29 +823,28 @@ console.log(anim.playState); // Should be 'running'.
     are introduced.
   </li>
   <li>
-    Generation of keyframe objects is described in detail
+    Generation of keyframe objects is described in detail.
   </li>
   <li>
-    The animation-composition property is introduced, 
-    which defines the composite operation used 
+    The 'animation-composition' property is introduced,
+    which defines the composite operation used
     when multiple animations affect the same property simultaneously.
   </li>
   <li>
-    The animation-timeline property is introduced, 
+    The 'animation-timeline' property is introduced,
     which defines the timeline used with the animation.
   </li>
   <li>
-    The animation shorthand property is updated 
+    The 'animation' shorthand property is updated
     to account for these new properties.
   </li>
   <li>
     Dispatch of animation events is described.
   </li>
   <li>
-    The CSSAnimation interface is added.
+    The {{CSSAnimation}} interface is added.
   </li>
   <li>
-    Requirements on pending style changesare described.
+    Requirements on pending style changes are described.
   </li>
-
 </ul>