autocorres: fix code inclusion in quickstart doc

The AutoCorres quickstart document includes code from `*.c` files from a
given line number, to avoid including license headers and other details
that aren't useful in the document. This updates the line numbers for
the current license headers.

Signed-off-by: Matthew Brecknell <Matthew.Brecknell@data61.csiro.au>

tools/autocorres/doc/quickstart/Chapter1_MinMax.thy

@@ -55,7 +55,7 @@ text \<open>
   which (we expect) return the minimum and maximum respectively of two unsigned
   integers.
 
-  \lstinputlisting[language=C, firstline=17]{../../minmax.c}
+  \lstinputlisting[language=C, firstline=13]{../../minmax.c}
 
   It is easy to see that \texttt{min} is correct, but perhaps less obvious why
   \texttt{max} is correct. AutoCorres will hopefully allow us to prove these

tools/autocorres/doc/quickstart/Chapter2_HoareHeap.thy

@@ -34,7 +34,7 @@ text \<open>
   Our C function \texttt{mult\_by\_add} implements a multiply operation
   by successive additions:
 
-\lstinputlisting[language=C, firstline=15]{../../mult_by_add.c}
+\lstinputlisting[language=C, firstline=11]{../../mult_by_add.c}
 
   We start by translating the program using the C parser and AutoCorres,
   and entering the generated locale \texttt{mult\_by\_add}.

tools/autocorres/doc/quickstart/Chapter3_HoareHeap.thy

@@ -19,7 +19,7 @@ text \<open>
   Here, we use AutoCorres to verify a C program that reads and writes to the heap.
   Our C function, \texttt{swap}, swaps two words in memory:
 
-\lstinputlisting[language=C, firstline=15]{../../swap.c}
+\lstinputlisting[language=C, firstline=11]{../../swap.c}
 
   Again, we translate the program using the C parser and AutoCorres.
 \<close>