Fix mouse events tutorial title (#1316)

tutorials/Mouse_Events/README.md

@@ -1,4 +1,4 @@
-# Getting Started with Compose for Desktop
+# Mouse events
 
 ## What is covered
 
@@ -208,4 +208,4 @@ fun main() = singleWindowApplication {
 ```
 <img alt="Application running" src="mouse_event.gif" height="500" />
 
-If you need more information about events there is an available raw AWT mouse event object in `mouseEvent` property of `PointerEvent`
+If you need more information about events there is an available raw AWT mouse event object in `mouseEvent` property of `PointerEvent`