Added descriptions to {cue,toc}_parse_prefix.h files.

src/lib/cue_parse_prefix.h

@@ -1,5 +1,5 @@
 /*
- * cue_parse_prefix.h
+ * cue_parse_prefix.h -- yacc symbol redefinitions (for cue parser)
  *
  *
  * Copyright (C) 2004, 2005 Svend Sorensen

src/lib/toc_parse_prefix.h

@@ -1,5 +1,5 @@
 /*
- * toc_parse_prefix.h
+ * toc_parse_prefix.h -- yacc symbol redefinitions (for toc parser)
  *
  * Copyright (C) 2004, 2005 Svend Sorensen
  * For license terms, see the file COPYING in this distribution.