fix Sphinx error in os.rst

diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index c3dfb3d46c50d7fdec22e6240d2b842a92e44cdf..74b89b872e572fa89e4131bd97240705dcff3300 100644 (file)
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -2294,8 +2294,8 @@ Files and Directories
       single: directory; walking
       single: directory; traversal
 
-    This behaves exactly like :func:`walk`, except that it yields a 4-tuple
-    ``(dirpath, dirnames, filenames, dirfd)``.
+   This behaves exactly like :func:`walk`, except that it yields a 4-tuple
+   ``(dirpath, dirnames, filenames, dirfd)``.
 
    *dirpath*, *dirnames* and *filenames* are identical to :func:`walk` output,
    and *dirfd* is a file descriptor referring to the directory *dirpath*.