#13233: fix typo.

Doc/library/os.rst

@@ -936,7 +936,7 @@ Files and Directories
          try:
              fp = open("myfile")
          except IOError as e:
-             if e.errno == errno.EACCESS:
+             if e.errno == errno.EACCES:
                  return "some default data"
              # Not a permission error.
              raise