fix acronym

Author: Vladimir Kotal

proc.tex

@@ -589,9 +589,9 @@
 example.
 \item \funnm{exec} does not transfer the control to the program in memory
 directly. As described on page \pageref{RUNTIMELINKER}, the system (i.e. the
-code of the \funnm{exec} call) first maps the dynamic linker, aka loader, to the
-process address space.  The loader then maps all dynamic libraries there as
-well, then finally calls the program \texttt{main()}.
+code of the \funnm{exec} call) first maps the dynamic linker, a.k.a. the loader,
+to the process address space.  The loader then maps all dynamic libraries there
+as well, then finally calls the program \texttt{main()}.
 \item A useful exercise is to write a simple program calling \texttt{open()},
 for example.  When done, run the program via \texttt{truss(1)} or
 \texttt{strace(1)} like this: \texttt{truss ./a.out}. You will see what is being