Fix missing spaces in os.walk example (GH-29918)

Lib/os.py

@@ -331,8 +331,8 @@ def walk(top, topdown=True, onerror=None, followlinks=False):
     import os
     from os.path import join, getsize
     for root, dirs, files in os.walk('python/Lib/email'):
-        print(root, "consumes", end="")
-        print(sum(getsize(join(root, name)) for name in files), end="")
+        print(root, "consumes ")
+        print(sum(getsize(join(root, name)) for name in files), end=" ")
         print("bytes in", len(files), "non-directory files")
         if 'CVS' in dirs:
             dirs.remove('CVS')  # don't visit CVS directories