Change the javadoc comment for FEATURE_VENDOR_MODULES

Somebody (ahem me) copy pasted the FEATURE_PAYLOAD_NOT_ROOT and forgot
to change the javadoc.

Test: n/a
Change-Id: I2f38a0806aa74f01ffed3c070830351eb66b7092
diff --git a/javalib/src/android/system/virtualmachine/VirtualMachineManager.java b/javalib/src/android/system/virtualmachine/VirtualMachineManager.java
index 0a79553..a0ba0c6 100644
--- a/javalib/src/android/system/virtualmachine/VirtualMachineManager.java
+++ b/javalib/src/android/system/virtualmachine/VirtualMachineManager.java
@@ -120,7 +120,7 @@
             IVirtualizationService.FEATURE_PAYLOAD_NON_ROOT;
 
     /**
-     * Feature to run payload as non-root user.
+     * Feature to allow vendor modules in Microdroid.
      *
      * @hide
      */