fix spelling

Author: Vladimir Kotal

synchro.tex

@@ -500,7 +500,7 @@
 \item \emsl{shared memory} \dots{} passing data between processes,
 brings similar problems as shared files, the solution is to use semaphores.
 \item \emsl{message queues} \dots{} provide both communication and
-synchronization (waiting for message to arrive) 
+synchronization (waiting for message to arrive)
 \item IPC means have \emsl{access rights} (for reading/writing) similarly to
 files for owner, group and others.
 \end{itemize}
@@ -509,11 +509,12 @@
 \begin{itemize}
 \item IPC resources continue to exist even after the process that created them
 is no longer around. To destroy them it is necessary to explicitly request this.
-From the shell the list of IPS resources can be acquired using 
+From the shell the list of IPS resources can be acquired using
 the \texttt{ipcs} command. They can be deleted using the \texttt{ipcrm} command.
 The state and contents of existing IPS resources is unchanged even if no process
 works with them at the moment.
-\item For more information, see \texttt{svipc(7)} man page on any Linux distro.
+\item For more information, see \texttt{svipc(7)} man page on any Linux
+distribution.
 \end{itemize}
 
 %%%%%
@@ -524,10 +525,10 @@
 \item introduced by E. Dijkstra
 \item semaphore is data structure that contains:
     \begin{itemize}
-    \item non-negative integer \texttt{i} (free capacity) 
+    \item non-negative integer \texttt{i} (free capacity)
     \item process queue \texttt{q}, that wait for free capacity
     \end{itemize}
-\item semaphore operations: 
+\item semaphore operations:
     \begin{description}
     \item [init(s, n)]~\\
     empty \texttt{s.q; s.i = n}