debian: Clarify previous Built-For-Profiles entry

The information is also available in the .changes files.

debian/changelog

@@ -30,9 +30,9 @@ dpkg (1.18.19) unstable; urgency=medium
 
   [ Guillem Jover ]
   * Stop emitting Built-For-Profiles from dpkg-gencontrol. The information
-    is already provided in .buildinfo files, and including it in the binary
-    packages makes them unreproducible even when the profile used would not
-    alter its contents. Closes: #831524
+    is already provided in .buildinfo and .changes files, and including it
+    in the binary packages makes them unreproducible even when the profile
+    used would not alter its contents. Closes: #831524
   * Do not allow empty epochs and revisions in versions. When there's at
     least one colon or one dash, we should expect epoch and revision numbers.
   * Always set SOURCE_DATE_EPOCH in dpkg-buildpackage and dpkg-source. Use