Update psql EXPLAIN help description, from Thomas.

src/bin/psql/psqlHelp.h

@@ -5,7 +5,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: psqlHelp.h,v 1.18 1997/06/03 06:19:11 vadim Exp $
+ * $Id: psqlHelp.h,v 1.19 1997/06/12 16:43:08 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -130,7 +130,7 @@ static struct _helpStruct QL_HELP[] = {
       "end [transaction];"},
   { "explain",
       "explain the query execution plan",
-      "explain [with {cost|plan|full}] <query>"},
+      "explain [verbose] <query>"},
   { "fetch",
       "retrieve tuples from a cursor",
       "fetch [forward|backward] [<number>|all] [in <cursorname>];"},