fix: mentioning 10 in loggin directive task

slides/creators/Decorating_the_Workflow.tex

@@ -307,7 +307,7 @@ \subsection{The Configuration File}
   	\end{lstlisting}
     Implement the log directive for all rules you consider worth being logged. What do you observe?
     \newline
-    You can take the \altverb{08_Snakemake} sample file to proceed.
+    You can take the \altverb{09_Snakemake} sample file to proceed. A working solution is \altverb{10_Snakefile} in your solutions folder.
   \end{task}
 \end{frame}