Update README.md

Author: vdjeric

README.md

@@ -29,7 +29,7 @@ scroll-boundary-behavior{-x,-y}: auto | contain | none
 
 where:
 * auto - Allow the default behavior for the user agent.
-* contain - Hint to disable scroll chaining. The user agent may show an appropriate overscroll affordance such as a glow/bounce etc. If the scroll chaining would trigger a non-scroll action, such as a navigation action, this property should be a hint to disable the navigation action.
+* contain - Hint to disable scroll chaining. The user agent may show an appropriate overscroll affordance. If the scroll chaining would trigger a non-scroll action, such as a navigation action, this property should be a hint to disable the navigation action.
 * none - Same as contain but also hint that no overscroll affordance should be triggered.
 
 This should apply to all, non-programatic, user scroll actions.