Tweak Debugging.md

Update title since it's not just about debugging any more.

Also add a note about VS Code config not always working.

Debugging.md

@@ -1,4 +1,4 @@
-# Debugging Desktop Flutter Applications in IDEs
+# Running and Debugging Flutter for Desktop in IDEs
 
 ## VS Code
 
@@ -13,6 +13,10 @@ To enable desktop support in Dart Code, add the flag to
 
 You may need to restart VS Code for this change to take effect.
 
+**Note**: This is not consistently working for everyone; investigation is
+in progress, but for now if this doesn't work, use the approach described
+under "Android Studio/IntelliJ" below.
+
 ### Running
 
 Once desktop support is enabled, you can run and debug using the normal