Remove references to the deleted test module VirtualizationTestCases

It was removed with I9b0637c40b0733a507f15f7dc439b466acbd8ab5.

Bug: N/A
Test: N/A
Change-Id: I2ea68183b8865956dae5e6657bb6c5f589d185fd
diff --git a/docs/getting_started/index.md b/docs/getting_started/index.md
index 62529b3..0e4f2be 100644
--- a/docs/getting_started/index.md
+++ b/docs/getting_started/index.md
@@ -56,7 +56,6 @@
 all can run via `atest`.
 
 ```shell
-atest VirtualizationTestCases.64
 atest MicrodroidHostTestCases
 atest MicrodroidTestApp
 ```