Updated deferred lang on libraries

Author: Tony Sansone

src/language/libraries.md

@@ -92,34 +92,25 @@ import 'package:lib2/lib2.dart' hide foo;
 <a id="deferred-loading"></a>
 #### Lazily loading a library
 
-_Deferred loading_ (also called _lazy loading_)
-allows a web app to load a library on demand,
-if and when the library is needed.
-Here are some cases when you might use deferred loading:
+*Deferred loading* (also called *lazy loading*) allows
+web and Flutter Android apps to load a library on demand.
 
-* To reduce a web app's initial startup time.
+Use deferred loading in the following use cases:
+
+* To reduce an Android or web app's initial startup time.
 * To perform A/B testing—trying out
-  alternative implementations of an algorithm, for example.
+  alternative implementations of an algorithm.
 * To load rarely used functionality, such as optional screens and dialogs.
 
-{{site.alert.warn}}
-  **Only `dart compile js` supports deferred loading.**
-  Flutter and the Dart VM don't support deferred loading.
-  To learn more, see
-  [issue #33118](https://github.com/dart-lang/sdk/issues/33118) and
-  [issue #27776.](https://github.com/dart-lang/sdk/issues/27776)
-{{site.alert.end}}
-
-To lazily load a library, you must first
-import it using `deferred as`.
+To lazily load a library, import it using `deferred as`.
 
 <?code-excerpt "misc/lib/language_tour/libraries/greeter.dart (import)" replace="/hello\.dart/package:greetings\/$&/g"?>
 ```dart
 import 'package:greetings/hello.dart' deferred as hello;
 ```
 
-When you need the library, invoke
-`loadLibrary()` using the library's identifier.
+When you need the library,
+invoke `loadLibrary()` using the library's identifier.
 
 <?code-excerpt "misc/lib/language_tour/libraries/greeter.dart (loadLibrary)"?>
 ```dart