fixed typo in machine name

Author: chrisdedman

doc/AstraKernelManual.pdf

@@ -70,7 +70,7 @@ \subsection{Prerequisites}
   \item \textbf{QEMU Emulator:}  
   QEMU is used to emulate the ARM VersatileAB (Cortex-A8) platform for kernel development and testing.
   \begin{itemize}
-    \item Ensure your QEMU installation supports the \texttt{Cortex-A8} machine.
+    \item Ensure your QEMU installation supports the \texttt{versatileab} machine.
     \item Example installation: \texttt{qemu-system-arm} via  qemu \url{https://www.qemu.org/download/}.
   \end{itemize}