Update coroutines-guide-ui.md

[Update]
- typo: what you might want to express here is `JavaScript event dispatch thread `

Author: rosuH

ui/coroutines-guide-ui.md

@@ -659,7 +659,7 @@ As you can see, execution immediately continues after [launch], while the corout
 for execution later. All UI dispatchers in `kotlinx.coroutines` are implemented this way. Why so? 
 
 Basically, the choice here is between "JS-style" asynchronous approach (async actions
-are always postponed to be executed later in the even dispatch thread) and "C#-style" approach
+are always postponed to be executed later in the event dispatch thread) and "C#-style" approach
 (async actions are executed in the invoker thread until the first suspension point).
 While, C# approach seems to be more efficient, it ends up with recommendations like
 "use `yield` if you need to ....". This is error-prone. JS-style approach is more consistent