fix order of magnitude

Author: vladak

history.tex

@@ -123,7 +123,7 @@
 %lines: 188319
 %find UNIX-v7/ -type f -name '*.[cshy]' | wc -l
 %    1131
-\item UNIX V7 had some 188 lines of source code in circa
+\item UNIX V7 had some 188k lines of source code in circa
 1100 files (determined using \texttt{find}, \texttt{wc} and \texttt{awk}
 across all files matching \texttt{*.[cshy]}).
 \item If you are interested in UNIX history, see the ``u{}nix'' on Wikipedia and