Tkinter rename reversal: remove tkinter package, adapt imports and docs.
diff --git a/Lib/lib-tk/tkMessageBox.py b/Lib/lib-tk/tkMessageBox.py
index df0a163..8f7483f 100644
--- a/Lib/lib-tk/tkMessageBox.py
+++ b/Lib/lib-tk/tkMessageBox.py
@@ -22,7 +22,7 @@
 # - type: dialog type; that is, which buttons to display (see below)
 #
 
-from tkinter.commondialog import Dialog
+from Tkinter.commondialog import Dialog
 
 #
 # constants