[docs] Mention RESUME opcode in whatsnew/3.11.rst (GH-95595) (GH-95851)

(cherry picked from commit cf28540)

Co-authored-by: esc <[email protected]>

Author: miss-islington

Doc/whatsnew/3.11.rst

@@ -1208,6 +1208,8 @@ CPython bytecode changes
 * :opcode:`JUMP_IF_TRUE_OR_POP` and :opcode:`JUMP_IF_FALSE_OR_POP` are now
   relative rather than absolute.
 
+* :opcode:`RESUME` has been added. It is a no-op. Performs internal tracing,
+  debugging and optimization checks.
 
 Deprecated
 ==========