Add __all__ for most modules beginning with 't' (#7373)

stdlib/tkinter/scrolledtext.pyi

@@ -1,6 +1,8 @@
 from tkinter import Frame, Misc, Scrollbar, Text
 from typing import Any
 
+__all__ = ["ScrolledText"]
+
 # The methods from Pack, Place, and Grid are dynamically added over the parent's impls
 class ScrolledText(Text):
     frame: Frame