[3.12] gh-120360: Add self as IDLE doc owner (GH-120571) (#120577)

gh-120360: Add self as IDLE doc owner (GH-120571)

Add self as IDLE doc owner
(cherry picked from commit cf49ef7)

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

Author: miss-islington

.github/CODEOWNERS

@@ -141,6 +141,7 @@ Lib/ast.py                    @isidentical
 **/*dataclasses*              @ericvsmith
 
 **/*idlelib*                  @terryjreedy
+/Doc/library/idle.rst         @terryjreedy
 
 **/*typing*                   @gvanrossum @JelleZijlstra @AlexWaygood