Change title to 'Synchronization' for better alignment with content

Since the primary focus of Chapter 12 is on the techniques used to
synchronize access to shared resources in a multi-CPU environment,
changing the title to 'Synchronization' would better reflect the content
and improve clarity.

lkmpg.tex

@@ -1672,7 +1672,7 @@ There are other variations of the \cpp|wait_for_completion| function, which incl
 
 \samplec{examples/completions.c}
 
-\section{Avoiding Collisions and Deadlocks}
+\section{Synchronization}
 \label{sec:synchronization}
 If processes running on different CPUs or in different threads try to access the same memory, then it is possible that strange things can happen or your system can lock up.
 To avoid this, various types of mutual exclusion kernel functions are available.