DOC: update linux install intro

Documentation/Cookbook/rst/Installation.rst

@@ -16,12 +16,14 @@ build from source or if we don’t provide packages for your system,
 information is available in the `Software Guide <http://orfeo-toolbox.org/SoftwareGuide/>`_,
 in the section "Building from Source".
 
+You can get latest binary packages from our `Download page <https://www.orfeo-toolbox.org/download>`__.
+
 Windows
 -------
 
 .. include:: Installation_Windows.txt
 
-Linux 64bit
+Linux x86_64
 -----------
 
 .. include:: Installation_Linux.txt

Documentation/Cookbook/rst/Installation_Linux.txt

-We provide for Linux 64 bits OS through standalone packages. They contain
-all OTB Applications and their launchers (both command line and
-graphical launchers are provided). Check the `Download page <https://www.orfeo-toolbox.org/download>`__
+We provide binary package for GNU/Linux x86_64. This package include
+all of OTB applications along with commandline and graphical launchers.
 
 This package is a self-extractible archive. You may uncompress it with a
 double-click on the file, or with the command line :