Improve the spec-file comment about testing

[skip changelog]

python-hatchling.spec

@@ -60,8 +60,8 @@ install -t '%{buildroot}%{_mandir}/man1' -D -p -m 0644 \
 
 
 %check
-# It’s not yet clear how, or if, we can run the upstream tests.
+# We cannot run the “downstream integration tests” included with the PyPI sdist
-# https://github.com/pypa/hatch/issues/120
+# in an offline build. The primary tests are Hatch’s “backend” tests.
 %pyproject_check_import