Skip clean steps from 'fake' interfaces in the documentation

They are not targeted at operators, and the title 'fake cleaning
steps' is confusing.

Change-Id: Ibe42ede09fcbc5d8c16c8b1996f6c4055ad6a138

doc/source/_exts/automated_steps.py

@@ -94,6 +94,9 @@ def _init_steps_by_driver():
         )
 
         for plugin in loader:
+            if plugin.name == 'fake':
+                continue
+
             steps = []
 
             for method_name, method in inspect.getmembers(plugin.plugin):