Correct typo in walk.__doc__ reported by Francois Pinard.

Lib/ntpath.py

@@ -255,7 +255,7 @@ def ismount(path):
 def walk(top, func, arg):
     """Directory tree walk whth callback function.
 
-    walk(top, func, args) calls func(arg, d, files) for each directory d 
+    walk(top, func, arg) calls func(arg, d, files) for each directory d 
     in the tree rooted at top (including top itself); files is a list
     of all the files and subdirs in directory d."""
     try:

Lib/posixpath.py

@@ -254,7 +254,7 @@ def ismount(path):
 # or to impose a different order of visiting.
 
 def walk(top, func, arg):
-    """walk(top,func,args) calls func(arg, d, files) for each directory "d" 
+    """walk(top,func,arg) calls func(arg, d, files) for each directory "d" 
 in the tree  rooted at "top" (including "top" itself).  "files" is a list
 of all the files and subdirs in directory "d".
 """