[css-ui-4] Fix typos

Author: frivoal

css-ui-4/Overview.bs

@@ -1046,10 +1046,10 @@ Omitted values are set to their initial values.
 			    or to look for warnings and error messages in a search engine…
 
 			Instead, a good practice is for authors is to selectively apply ''user-select: none'' to elements
-			which seem likely to be accidentaly selected
-			when doing so would interfere with the more likely intended acction.
-			Accidentally leaving parts of the page that are unlikely to be intereacted with selectable
-			will likely cause much less frustration to users than the oposite.
+			which seem likely to be accidentally selected
+			when doing so would interfere with the more likely intended action.
+			Accidentally leaving parts of the page that are unlikely to be interacted with selectable
+			will likely cause much less frustration to users than the opposite.
 		</div>
 
 		<dt><dfn>contain</dfn>