org.texi: Add Fortran to supported languages

* doc/org.texi (Languages): Add Fortran.

Reported-by: Alain Cochard <Alain.Cochard@unistra.fr>
<http://permalink.gmane.org/gmane.emacs.orgmode/97534>

doc/org.texi

@@ -15034,20 +15034,20 @@ Code blocks in the following languages are supported.
 @item C++ @tab C++ @tab Clojure @tab clojure
 @item CSS @tab css @tab D @tab d
 @item ditaa @tab ditaa @tab Graphviz @tab dot
-@item Emacs Lisp @tab emacs-lisp @tab gnuplot @tab gnuplot
-@item Haskell @tab haskell @tab Java @tab java
-@item Javascript @tab js @tab LaTeX @tab latex
-@item Ledger @tab ledger @tab Lisp @tab lisp
-@item Lilypond @tab lilypond @tab MATLAB @tab matlab
-@item Mscgen @tab mscgen @tab Objective Caml @tab ocaml
-@item Octave @tab octave @tab Org mode @tab org
-@item Oz @tab oz @tab Perl @tab perl
-@item Plantuml @tab plantuml @tab Processing.js @tab processing
-@item Python @tab python @tab R @tab R
-@item Ruby @tab ruby @tab Sass @tab sass
-@item Scheme @tab scheme @tab GNU Screen @tab screen
-@item shell @tab sh @tab SQL @tab sql
-@item SQLite @tab sqlite
+@item Emacs Lisp @tab emacs-lisp @tab Fortran @tab fortran
+@item gnuplot @tab gnuplot @tab Haskell @tab haskell 
+@item Java @tab java @tab Javascript @tab js 
+@item LaTeX @tab latex @tab Ledger @tab ledger 
+@item Lisp @tab lisp @tab Lilypond @tab lilypond 
+@item MATLAB @tab matlab @tab Mscgen @tab mscgen 
+@item Objective Caml @tab ocaml @tab Octave @tab octave 
+@item Org mode @tab org @tab Oz @tab oz 
+@item Perl @tab perl @tab Plantuml @tab plantuml 
+@item Processing.js @tab processing @tab Python @tab python 
+@item R @tab R @tab Ruby @tab ruby 
+@item Sass @tab sass @tab Scheme @tab scheme 
+@item GNU Screen @tab screen @tab shell @tab sh 
+@item SQL @tab sql @tab SQLite @tab sqlite
 @end multitable
 
 Language-specific documentation is available for some languages.  If