Update mojo_run to use mojo:launcher instead of mojo:kiosk_wm.

mojo/devtools/common/docs/mojo_run.md

Index: mojo/devtools/common/docs/mojo_run.md
diff --git a/mojo/devtools/common/docs/mojo_run.md b/mojo/devtools/common/docs/mojo_run.md
index ad4f0e269a81ddb924bb55ff239181b6e20d7e89..aa60937ca1dc1af9ddb00d518e9460bd5a4affad 100644
--- a/mojo/devtools/common/docs/mojo_run.md
+++ b/mojo/devtools/common/docs/mojo_run.md
@@ -16,17 +16,13 @@ binary:
 mojo_run --shell-path path/to/shell/binary APP_URL
 ```
 
-Some applications are meant to be run embedded in a **window manager**. To run
-these, you can pass the app url using the `--embed` flag. This will run the
-window manager and pass the given url to it:
+Some applications implement ViewProvider and are run embedded in a view. To run
+these, you can pass the app url using the `--embed` flag:
 
 ```sh
 mojo_run --embed APP_URL [--android]
 ```
 
-By default, `mojo_run` uses mojo:kiosk_wm as the window manager. You can pass a
-different window manager url using the `--window-manager` flag to override this.
-
 ## Running multiple instances simultaneously
 
 `mojo_run` sets up development servers on fixed ports to facilitate caching