removed unused doc.txt entries from info.ss files

svn: r8529

original commit: 59b5f3a72758c7d6eaec0a04f243e76afbb43762

collects/parser-tools/info.ss

@@ -1,5 +1,4 @@
 
 (module info setup/infotab
-  (define doc.txt "doc.txt")
   (define name "Parser-tools"))
 

collects/parser-tools/lex.ss

@@ -1,7 +1,7 @@
 (module lex mzscheme
 
   ;; Provides the syntax used to create lexers and the functions needed to
-  ;; create and use the buffer that the lexer reads from.  See doc.txt.
+  ;; create and use the buffer that the lexer reads from.  See docs.
 	
   (require-for-syntax (lib "list.ss")
                       (lib "stx.ss" "syntax")