complete details for the "ai" command in the C shell

doc/runtime-api.html

@@ -894,7 +894,7 @@ Det -> CN -> NP
 </pre>
 <pre class="haskell">
 Prelude PGF2> print (functionType gr "DetCN")
-Det -> CN -> NP
+Just (Det -> CN -> NP)
 </pre>
 <pre class="java">
 System.out.println(gr.getFunctionType("DetCN"));