fix wording/formatting

Author: Vladimir Kotal

proc.tex

@@ -496,10 +496,10 @@
 \item To get information about running processes programmatically is possible
 using non-standard API (e.g. the \texttt{libproc} library on Solaris built
 on top of the \texttt{procfs} filesystem that is mounted under \texttt{/proc}).
-\item Note that using \texttt{getppid} value to check if parent exited is not
-portable (commonly \texttt{init} has \texttt{pid} 1 however this is not true in
-many virtualized/containerized environments, e.g. in PID namespaces on Linux,
-Zones in Solaris).\\
+\item Note that using the value returned from \texttt{getppid} to check if
+parent exited is not portable (commonly \texttt{init} has \texttt{pid} 1 however
+this is not true in many virtualized/containerized environments, e.g. in
+\emph{PID namespaces} on Linux, Zones in Solaris).\\
 Example: \example{session/getppid.c}.
 \end{itemize}