Issue #27626: Spelling fixes in docs, comments and internal names

Based on patch by Ville Skyttä.
diff --git a/Lib/idlelib/CallTipWindow.py b/Lib/idlelib/CallTipWindow.py
index 90c2d7c..e63164b 100644
--- a/Lib/idlelib/CallTipWindow.py
+++ b/Lib/idlelib/CallTipWindow.py
@@ -9,7 +9,7 @@
 HIDE_SEQUENCES = ("<Key-Escape>", "<FocusOut>")
 CHECKHIDE_VIRTUAL_EVENT_NAME = "<<calltipwindow-checkhide>>"
 CHECKHIDE_SEQUENCES = ("<KeyRelease>", "<ButtonRelease>")
-CHECKHIDE_TIME = 100 # miliseconds
+CHECKHIDE_TIME = 100 # milliseconds
 
 MARK_RIGHT = "calltipwindowregion_right"