Add comment about W002

Co-authored-by: Stan Ulbrych <stan@python.org>

Author: hugovk

pyproject.toml

@@ -3,6 +3,9 @@ requires = ["setuptools>=40.8.0", "wheel"]
 build-backend = "setuptools.build_meta"
 
 [tool.check-wheel-contents]
+# The wheel contains duplicate files.
+# This is by design, see https://github.com/eggert/tz/blob/main/backward
+# Let's ignore the warning:
 ignore = ["W002"]
 
 [tool.isort]