[css-overflow-3] Fix typo

Author: frivoal

css-overflow-3/Overview.bs

@@ -719,7 +719,7 @@ Smooth Scrolling: The 'scroll-behavior' Property</h3>
 
 		<dt><dfn>smooth</dfn>
 		<dd>
-			The <a>scrolling box</a> is scrolled in a <a spec=cssom-view lt="smoot scroll">smooth</a> fashion
+			The <a>scrolling box</a> is scrolled in a <a spec=cssom-view lt="smooth scroll">smooth</a> fashion
 			using a user-agent-defined timing function over a user-agent-defined period of time.
 			User agents should follow platform conventions, if any. <!--fingerprint-->
 	</dl>