Remove mention of using "man" from the tutorial.

This isn't applicable on Windows, and the internal link to the
psql documentation should be more than sufficient.

Susanne Ebrecht

Author: robertmhaas

doc/src/sgml/start.sgml

@@ -403,11 +403,8 @@ mydb=#
     command shell. (For more internal commands, type
     <literal>\?</literal> at the <command>psql</command> prompt.)  The
     full capabilities of <command>psql</command> are documented in
-    <xref linkend="app-psql">.  If <productname>PostgreSQL</> is
-    installed correctly you can also type <literal>man psql</literal>
-    at the operating system shell prompt to see the documentation.  In
-    this tutorial we will not use these features explicitly, but you
-    can use them yourself when it is helpful.
+    <xref linkend="app-psql">.  In this tutorial we will not use these
+    features explicitly, but you can use them yourself when it is helpful.
    </para>
 
   </sect1>