use helper function for intro text instead of rewriting it

Author: adqm

Lib/pydoc.py

@@ -2112,7 +2112,7 @@ def help(self, request, is_cli=False, is_interactive=False):
 
     def helphelp(self, is_interactive=False):
         if is_interactive:
-            self.output.write(_introdoc())
+            self.intro()
         else:
             pager(textwrap.dedent("""\
                 help - Interactive Help