gh-81479: For Help => IDLE Doc, stop double-spacing some lists. (#114168)

This matches Firefox format.  Edge double-spaces non-simple
list but I think it looks worse.

Lib/idlelib/help.py

@@ -102,7 +102,7 @@ def handle_starttag(self, tag, attrs):
             if self.level > 0:
                 self.nested_dl = True
         elif tag == 'li':
-            s = '\n* ' if self.simplelist else '\n\n* '
+            s = '\n* '
         elif tag == 'dt':
             s = '\n\n' if not self.nested_dl else '\n'  # Avoid extra line.
             self.nested_dl = False