PYTHON: clarify docs.
PYTHON: clarify docs.


Revision created by MOE tool push_codebase.
MOE_MIGRATION=6925

lordzuko/appengine-mapreduce,aozarov/appengine-mapreduce,VirusTotal/appengine-mapreduce,soundofjw/appengine-mapreduce,westerhofffl/appengine-mapreduce,GoogleCloudPlatform/appengine-mapreduce,VirusTotal/appengine-mapreduce,vendasta/appengine-mapreduce,soundofjw/appengine-mapreduce,bmenasha/appengine-mapreduce,chargrizzle/appengine-mapreduce,lordzuko/appengine-mapreduce,aozarov/appengine-mapreduce,soundofjw/appengine-mapreduce,GoogleCloudPlatform/appengine-mapreduce,Candreas/mapreduce,chargrizzle/appengine-mapreduce,chargrizzle/appengine-mapreduce,rbruyere/appengine-mapreduce,potatolondon/potato-mapreduce,ankit318/appengine-mapreduce,mikelambert/appengine-mapreduce,vendasta/appengine-mapreduce,mikelambert/appengine-mapreduce,Candreas/mapreduce,talele08/appengine-mapreduce,ankit318/appengine-mapreduce,VirusTotal/appengine-mapreduce,lordzuko/appengine-mapreduce,mikelambert/appengine-mapreduce,aozarov/appengine-mapreduce,rbruyere/appengine-mapreduce,westerhofffl/appengine-mapreduce,rbruyere/appengine-mapreduce,ankit318/appengine-mapreduce,vendasta/appengine-mapreduce,talele08/appengine-mapreduce,potatolondon/potato-mapreduce,GoogleCloudPlatform/appengine-mapreduce,ankit318/appengine-mapreduce,vendasta/appengine-mapreduce,mikelambert/appengine-mapreduce,aozarov/appengine-mapreduce,VirusTotal/appengine-mapreduce,mikelambert/appengine-mapreduce,ankit318/appengine-mapreduce,soundofjw/appengine-mapreduce,GoogleCloudPlatform/appengine-mapreduce,Candreas/mapreduce,chargrizzle/appengine-mapreduce,lordzuko/appengine-mapreduce,aozarov/appengine-mapreduce,talele08/appengine-mapreduce,rbruyere/appengine-mapreduce,westerhofffl/appengine-mapreduce,chargrizzle/appengine-mapreduce,soundofjw/appengine-mapreduce,bmenasha/appengine-mapreduce,Candreas/mapreduce,westerhofffl/appengine-mapreduce,bmenasha/appengine-mapreduce,VirusTotal/appengine-mapreduce,Candreas/mapreduce,rbruyere/appengine-mapreduce,GoogleCloudPlatform/appengine-mapreduce,talele08/appengine-mapreduce,lordzuko/appengine-mapreduce,westerhofffl/appengine-mapreduce,bmenasha/appengine-mapreduce,talele08/appengine-mapreduce,bmenasha/appengine-mapreduce,vendasta/appengine-mapreduce,potatolondon/potato-mapreduce