Fixed typo in example code; spotted by Everett Lipman

<lipman@sphere.niddk.nih.gov>.

Doc/tut/tut.tex

@@ -2538,7 +2538,7 @@ right operand, e.g.
 ...     print '%-10s ==> %10d' % (name, phone)
 ... 
 Jack       ==>       4098
-Dcab       ==>    8637678
+Dcab       ==>       7678
 Sjoerd     ==>       4127
 \end{verbatim}