Correct typo: the option is 'formats' not 'format'.

Doc/dist/dist.tex

@@ -1278,7 +1278,7 @@ Windows installers is usually as easy as running:
 python setup.py bdist_wininst
 \end{verbatim}
 
-or the \command{bdist} command with the \longprogramopt{format} option:
+or the \command{bdist} command with the \longprogramopt{formats} option:
 
 \begin{verbatim}
 python setup.py bdist --formats=wininst