[tor-bugs] #7673 [Stem]: small pydoc fixes

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#7673: small pydoc fixes
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 Reporter:  robinson  |          Owner:  atagar
     Type:  defect    |         Status:  new   
 Priority:  normal    |      Milestone:        
Component:  Stem      |        Version:        
 Keywords:            |         Parent:        
   Points:            |   Actualpoints:        
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 Please make sure that the "DOC: stem.ProtocolError may be raised by
 Controller.get_info" commit is correct.

 Pull fix-docs branch from git://gitorious.org/stem-robinson/stem-
 robinson.git

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7673>
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