Fix typo in README.md

Replace support-4v-demos with the correct
support-v4-demos

Change-Id: I5523a317c5cddac043dad182d73ed9fb0fbf53b2
diff --git a/README.md b/README.md
index 224ffff..b775e48 100644
--- a/README.md
+++ b/README.md
@@ -116,7 +116,7 @@
 ## Running Sample Apps
 The AndroidX repository has a set of Android applications that exercise AndroidX code. These applications can be useful when you want to debug a real running application, or reproduce a problem interactively, before writing test code.
 
-These applications are named either `<libraryname>-integration-tests-testapp`, or `support-\*-demos` (e.g. `support-4v-demos` or `support-leanback-demos`). You can run them by clicking `Run > Run ...` and choosing the desired application.
+These applications are named either `<libraryname>-integration-tests-testapp`, or `support-\*-demos` (e.g. `support-v4-demos` or `support-leanback-demos`). You can run them by clicking `Run > Run ...` and choosing the desired application.
 
 ## Password and Contributor Agreement before making a change
 Before uploading your first contribution, you will need setup a password and agree to the contribution agreement: