doc/_ext: mute syntax check warn E711

According to E711 of PEP0008:

When compare to None, should use 'is' instead of '=='

Signed-off-by: Drunkard Zhang <[email protected]>

Author: drunkard

doc/_ext/ceph_commands.py

@@ -94,7 +94,7 @@ def __init__(self, type, name,
         self.goodchars = goodchars
         self.positional = positional != 'false'
 
-        assert who == None
+        assert who is None
 
     def help(self):
         advanced = []