fix typo (#339)

docs/tex/troubleshooting.tex

@@ -36,7 +36,7 @@ \subsubsection{TensorFlow via \texttt{conda}}
 
 \begin{lstlisting}[language=JSON]
 conda config --add channels conda-forge
-conda create -n cpu-tf-edward numpy scyip six tensorflow
+conda create -n cpu-tf-edward numpy scipy six tensorflow
 source activate cpu-tf-edward
 pip install edward
 \end{lstlisting}