Move comment to license_note

Comment not preserved during refresh.

Test: m nothing
Change-Id: I3bc4a1218245b0153136d12f64371f9a2e8a80d3
diff --git a/METADATA b/METADATA
index 2426d81..3066911 100644
--- a/METADATA
+++ b/METADATA
@@ -2,7 +2,6 @@
 #     CONSULT THE OWNERS AND opensource-licensing@google.com BEFORE
 #     DEPENDING ON IT IN YOUR PROJECT. ***
 third_party {
-  # would be NOTICE save for GFDL in:
-  #   src/test/resources/testData/packaging/text-files/wikipedia.html
+  license_note: "would be NOTICE save for GFDL in: src/test/resources/testData/packaging/text-files/wikipedia.html"
   license_type: BY_EXCEPTION_ONLY
 }