Adjust news fragment for more descriptiveness

Author: abravalheri

changelog.d/3594.change.rst

@@ -0,0 +1,9 @@
+Fixed interaction between ``setuptools``' package auto-discovery and
+auto-generated ``htmlcov`` files.
+
+Previously, the ``htmlcov`` name was ignored when searching for single-file
+modules, however the correct behaviour is to ignore it when searching for
+packages (since it is supposed to be a directory, see `coverage config`_)
+-- by :user:`yukihiko-shinoda`.
+
+.. _coverage config: https://coverage.readthedocs.io/en/stable/config.html#html-directory