[3.13] Docs: Fix REPL example in Doc/library/shutil.rst (pythonGH-132700) (python#132728)

Docs: Fix REPL example in `Doc/library/shutil.rst` (pythonGH-132700)
(cherry picked from commit e154e4d)

Co-authored-by: Stan Ulbrych <[email protected]>

Author: miss-islington

Doc/library/shutil.rst

@@ -473,7 +473,7 @@ Directory and files operations
    This is also applied when *cmd* is a path that contains a directory
    component::
 
-      >> shutil.which("C:\\Python33\\python")
+      >>> shutil.which("C:\\Python33\\python")
       'C:\\Python33\\python.EXE'
 
    .. versionadded:: 3.3