Make all the \seemodule explanations consistent: start with a capitalized

letter and end with proper punctuation.  "Documenting Python" will be
updated accordingly so that this will be editorial policy for the Python
documentation.

Doc/lib/libtoken.tex

@@ -36,6 +36,9 @@ Return true for non-terminal token values.
 Return true if \var{x} is the marker indicating the end of input.
 \end{funcdesc}
 
+
 \begin{seealso}
-\seemodule{parser}{second example uses this module}
+  \seemodule{parser}{The second example for the \refmodule{parser}
+                     module shows how to use the \module{symbol}
+                     module.}
 \end{seealso}