[3.13] Docs: Fix typo in os.fwalk() example (GH-138486) (GH-138501)

Docs: Fix typo in `os.fwalk()` example (GH-138486)
(cherry picked from commit 849a80e)

Co-authored-by: William Andrea <[email protected]>

Author: miss-islington

Doc/library/os.rst

@@ -3687,9 +3687,9 @@ features:
 
       import os
       for root, dirs, files, rootfd in os.fwalk('python/Lib/xml'):
-          print(root, "consumes", end="")
+          print(root, "consumes", end=" ")
           print(sum([os.stat(name, dir_fd=rootfd).st_size for name in files]),
-                end="")
+                end=" ")
           print("bytes in", len(files), "non-directory files")
           if '__pycache__' in dirs:
               dirs.remove('__pycache__')  # don't visit __pycache__ directories