blessed genocide bit

A suggestion to the mailing list.  If the response is more than a single
letter and doesn't match any class description, don't say "symbol" in the
followup message.  I left "symbol" in if the response in a single
character, I thought it was more helpful.

src/read.c

@@ -1499,7 +1499,8 @@ do_class_genocide()
 			    return;
 			} else
 #endif
-	pline("That symbol does not represent any monster.");
+			    pline("That %s does not represent any monster.",
+				  strlen(buf) == 1 ? "symbol" : "response");
 			continue;
 		}