Update obsolete comments.

src/include/parser/keywords.h

 /*-------------------------------------------------------------------------
  *
  * keywords.h
- *	  string,atom lookup thingy, reduces strcmp traffic greatly
- *	  in the bowels of the system.	Look for actual defs in lib/C/atoms.c
+ *	  lexical token lookup for reserved words in postgres SQL
  *
  *
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: keywords.h,v 1.7 2000/01/26 05:58:26 momjian Exp $
+ * $Id: keywords.h,v 1.8 2000/08/29 02:00:38 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -22,6 +21,5 @@ typedef struct ScanKeyword
 } ScanKeyword;
 
 extern ScanKeyword *ScanKeywordLookup(char *text);
-extern char *AtomValueGetString(int atomval);
 
 #endif	 /* KEYWORDS_H */