Fix an obvious typo (It *is* a typo, or not?)

Doc/dist/dist.tex

@@ -693,7 +693,7 @@ The corresponding call to \function{setup()} might be:
 setup(...,
       packages=['mypkg'],
       package_dir={'mypkg': 'src/mypkg'},
-      package_data={'pypkg': ['data/*.dat']},
+      package_data={'mypkg': ['data/*.dat']},
       )
 \end{verbatim}