Fix typo #23

source/latex/uosdocs/uosdocs.dtx

@@ -1701,7 +1701,7 @@ There is no prescribed font, you should use a font appropriate to your disciplin
 \begin{lstlisting}[caption=Listing of what an example listing would be like]
 This is a test listing
 
-The test listing has serveral lines
+The test listing has several lines
 to show how the listings
 will be displayed
 \end{lstlisting}