Add comment for added restriction.

See: http://go/android-license-checking-v2-lsc

Test: m all

Bug: 151953481
Bug: 151177513
Bug: 67772237
Change-Id: I9b7e3b470e32cd24abff4bd7c238a50b12889d9f
diff --git a/METADATA b/METADATA
index 6d8601b..0777ece 100644
--- a/METADATA
+++ b/METADATA
@@ -1,3 +1,5 @@
 third_party {
+  # would be NOTICE save for the CC-BY-SA in
+  # samples/browseable/XYZTouristAttractions/Application/src/com.example.android.xyztouristattractions/provider/TouristAttractions.java
   license_type: RESTRICTED
 }