!fixup 11d2dfa test(rsync): clarify the two possible expected results

Author: akinomyoga

test/t/test_rsync.py

@@ -80,6 +80,8 @@ def test_local_path_with_spaces(self, completion):
         is defined in completions/ssh, through the rsync interface.  We reuse
         the fixture directory for the test of the scp completion.
 
-        The expected result depends on the rsync version.
+        The expected result depends on the rsync version, so we check the
+        result if it matches either one of two possible expected results.
+
         """
         assert completion == r"\ conf" or completion == r"\\\ conf"