Instructions say "run your app using dart bin/__projectName__.dart"

[DanTup]

After creating an app, it says:

6 files written.

--> to provision required packages, run 'pub get'
--> run your app using `dart bin/__projectName__.dart`.

It looks a bit weird having __projectName__ here - should it have been replaced?

[devoncarew]

Yes, this is a bug. The text doesn't participate in the template replacement, so likely shouldn't have been updated as part of #659.

We could do something like replace the guidance with 'dart run'.

cc @jwren