Fix mismatched @def/@end pairs (inadvertently nested?).

lispref/strings.texi

 @c -*-texinfo-*-
 @c This is part of the GNU Emacs Lisp Reference Manual.
-@c Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999
+@c Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2003
 @c   Free Software Foundation, Inc.
 @c See the file elisp.texi for copying conditions.
 @setfilename ../info/strings
@@ -269,10 +269,6 @@ result list.  Otherwise, null strings are left in the result.
 If @var{separators} is @code{nil} (or omitted),
 the default is the value of @code{split-string-default-separators}.
 
-@defvar split-string-default-separators
-The default value of @var{separators} for @code{split-string}, initially
-@samp{"[ \f\t\n\r\v]+"}.
-
 As a special case, when @var{separators} is @code{nil} (or omitted),
 null strings are always omitted from the result.  Thus:
 
@@ -311,6 +307,11 @@ Empty matches do count, when not adjacent to another match:
 @end example
 @end defun
 
+@defvar split-string-default-separators
+The default value of @var{separators} for @code{split-string}, initially
+@samp{"[ \f\t\n\r\v]+"}.
+@end defvar
+
 @node Modifying Strings
 @section Modifying Strings