fix formatting

Author: Vladimir Kotal

signals.tex

@@ -550,7 +550,7 @@
 \item Both arguments \emph{\texttt{oset}} and \emph{set} may be \texttt{NULL}.
 If both are \texttt{NULL} in the same invocation of the function, nothing
 happens.
-\item \texttt{sigpending} sets the set in the argument to the pending mask.
+\item \texttt{sigpending} sets the set in the argument to the pending mask. \\
 See \example{signals/sigpending.c}.
 \end{itemize}