Partial fix for SF bug 123730: extra backslash in tutorial.

Doc/tut/tut.tex

@@ -767,7 +767,7 @@ special characters in the string, you can do so by using the Python
 \emph{Unicode-Escape} encoding. The following example shows how:
 
 \begin{verbatim}
->>> u'Hello\\u0020World !'
+>>> u'Hello\u0020World !'
 u'Hello World !'
 \end{verbatim}