Apply suggestions from code review

Co-authored-by: bkap123 <97006829+bkap123@users.noreply.github.com>

Author: NekoAsakura

Lib/test/test_xml_etree.py

@@ -381,7 +381,7 @@ def test_simpleops(self):
         self.serialize_check(element,
                 '<tag key="value"><subtag /><subtag /></tag>')
 
-    def test_element_init(self):
+    def test_positional_only_parameter(self):
         # Test Element positional-only parameters (gh-144846).
 
         # 'tag' is positional-only