pythongh-104499: Fix typo. (pythonGH-104598)

(cherry picked from commit c5b670e)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Author: terryjreedy

Lib/idlelib/autocomplete_w.py

@@ -186,7 +186,7 @@ def show_window(self, comp_lists, index, complete, mode, userWantsWin):
         acw.withdraw()
         acw.wm_overrideredirect(1)
         try:
-            # Prevent grabbing focus on maxOS.
+            # Prevent grabbing focus on macOS.
             acw.tk.call("::tk::unsupported::MacWindowStyle", "style", acw._w,
                         "help", "noActivates")
         except TclError: