Add comments on compat files

To prevent further confusion.

Bug: 258029505
Test: manual
Change-Id: Iaa145e4480833a224b1a07fc68adb7d3e8a36e4b
diff --git a/private/compat/32.0/32.0.cil b/private/compat/32.0/32.0.cil
index 3672436..171f0ad 100644
--- a/private/compat/32.0/32.0.cil
+++ b/private/compat/32.0/32.0.cil
@@ -9,6 +9,7 @@
 (type vr_hwc)
 (type vr_hwc_exec)
 
+;; mapping information from ToT policy's types to 32.0 policy's types.
 (expandtypeattribute (DockObserver_service_32_0) true)
 (expandtypeattribute (IProxyService_service_32_0) true)
 (expandtypeattribute (aac_drc_prop_32_0) true)