Update ART Service doc.

This is to reflect aosp/2421121.

Bug: 264794495
Test: N/A
Ignore-AOSP-First: ART Services
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:828dd390cd725d0f930601cdf89f23ab8071f386)
Merged-In: I77e67ed99fef51956cc2d4c8a5478b93ebd75237
Change-Id: I77e67ed99fef51956cc2d4c8a5478b93ebd75237
diff --git a/libartservice/service/README.md b/libartservice/service/README.md
index b5fa24e..028f5f5 100644
--- a/libartservice/service/README.md
+++ b/libartservice/service/README.md
@@ -86,9 +86,10 @@
 *cloud profile*), it uses the "speed-profile" compiler filter. Otherwise, it
 uses the "verify" compiler filter.
 
-Note: If the app is installed along with a DM file that only contains a VDEX
-file (but not a profile), no dexopt will be performed because the compiler
-filter will be "verify" and the VDEX file is satisfactory.
+Note: If the APK is uncompressed and aligned, and it is installed along with a
+DM file that only contains a VDEX file (but not a profile), no dexopt will be
+performed because the compiler filter will be "verify" and the VDEX file is
+satisfactory.
 
 Note: There is no secondary dex file present during installation.