[3.13] Backport idlelib typos (#124325)

See #123597.  The typo in Icon/README.txt was fixed
in the unmerged 3.13 backport #123608 of the
PR that added the text with the typo.

(cherry picked from commit 1f4a49e)

Co-authored-by: abstractee

Author: terryjreedy

Lib/idlelib/config.py

@@ -600,7 +600,7 @@ def GetCoreKeys(self, keySetName=None):
         """
         # TODO: = dict(sorted([(v-event, keys), ...]))?
         keyBindings={
-            # vitual-event: list of key events.
+            # virtual-event: list of key events.
             '<<copy>>': ['<Control-c>', '<Control-C>'],
             '<<cut>>': ['<Control-x>', '<Control-X>'],
             '<<paste>>': ['<Control-v>', '<Control-V>'],

Lib/idlelib/editor.py

@@ -914,7 +914,7 @@ def RemoveKeybindings(self):
     def ApplyKeybindings(self):
         """Apply the virtual, configurable keybindings.
 
-        Alse update hotkeys to current keyset.
+        Also update hotkeys to current keyset.
         """
         # Called from configdialog.activate_config_changes.
         self.mainmenu.default_keydefs = keydefs = idleConf.GetCurrentKeySet()

Lib/idlelib/extend.txt

@@ -52,7 +52,7 @@ should probably be refined in the future.)
 
 Extensions are not required to define menu entries for all the events they
 implement.  (They are also not required to create keybindings, but in that
-case there must be empty bindings in cofig-extensions.def)
+case there must be empty bindings in config-extensions.def)
 
 Here is a partial example from zzdummy.py: