Updating documentation

doc/introduction-to-mongo.tex

@@ -192,8 +192,12 @@ The first section of the \texttt{'planets.json'} file is given in Listing~\ref{l
 
 \lstinputlisting[caption={The file planets\_database.py.},label=listing:planets_database.py,language=python]{"../python/planets_database.py"}
 
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 \lstinputlisting[caption={The first 24 lines of the file planets.json.},label=listing:planets.json,language=java,lastline=24]{"../python/planets.json"}
 
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 \item Run the \texttt{select\_planet.py} program, in a similar manner as Listing~\ref{listing:create-database-run}.
 
 The contents of \texttt{select\_planet.py} are given in Listing~\ref{listing:select_planet.py}.  This Python program prints the names of the collections and then checks if the \texttt{'orbit\_data'} collection is present.  If the \texttt{'OrbitData'} collection is present, it prints the names of each of the planets and the complete document for Pluto.