gh-140078: fix typo in tkinter docs (#140081)

Remove extraneous word.

diff --git a/Doc/library/tkinter.rst b/Doc/library/tkinter.rst
index f284988daf2d4e3811a1a9a5dcdecadeeab603dc..be26af02bcee0d38a4e199bb89c35ad5d9ffeadf 100644 (file)
--- a/Doc/library/tkinter.rst
+++ b/Doc/library/tkinter.rst
@@ -392,7 +392,7 @@ by spaces. Without getting into too many details, notice the following:
 * Operations which are implemented as separate *commands* in Tcl (like
   ``grid`` or ``destroy``) are represented as *methods* on Tkinter widget
   objects. As you'll see shortly, at other times Tcl uses what appear to be
-  method calls on widget objects, which more closely mirror what would is
+  method calls on widget objects, which more closely mirror what is
   used in Tkinter.