fix doc

doc/setup.tex

@@ -41,7 +41,7 @@ just having a single copy of mad binary.
 \begin{lstlisting}
     # mad app sample
     # cd sample
-    # mad deps compile plan bundle web_app
+    # mad deps compile plan bundle sample
 \end{lstlisting}
 \vspace{1\baselineskip}
 
@@ -50,7 +50,7 @@ Mac and open \footahref{http://localhost:8000}{http://localhost:8000}.
 
 \vspace{1\baselineskip}
 \begin{lstlisting}
-    C:\> escript web_app
+    C:\> escript sample
     Applications: [kernel,stdlib,crypto,cowlib,ranch,
                    cowboy,compiler,syntax_tools,
                    erlydtl,gproc,xmerl,n2o,sample,