doc/sphinx: Update Debian information

Update Debian version references.
This is the last missing documentation update from #230.

Closes #230.

Change-Id: I79828d2e6a0f8f43c989a03ba10944b1d5d70f2d

Author: Aurelien Degremont

doc/sphinx/install.rst

@@ -28,7 +28,7 @@ operating systems:
 * GNU/Linux RedHat EL5 or CentOS 5.x (Python 2.4), EL6 (Python 2.6) and EL7
   (Python 2.7)
 * GNU/Linux Fedora 11 to 22 (Python 2.6 - 2.7),
-* GNU/Linux Debian (wheezy and sid)
+* GNU/Linux Debian (wheezy and above)
 * Mac OS X 10.5.8 or more
 
 Distribution
@@ -108,15 +108,16 @@ Then, the ClusterShell installation procedure is quite the same of the Fedora
 Debian
 ^^^^^^
 
-ClusterShell is available in Debian since the *wheezy* testing release (February 2011):
-
-* http://packages.debian.org/wheezy/clustershell
-* http://packages.debian.org/sid/clustershell
+ClusterShell is available in Debian **main** repository (since 2011).
 
 To install it on Debian, simply use::
 
     $ apt-get install clustershell
 
+You can get the latest version on::
+
+* http://packages.debian.org/sid/clustershell
+
 
 Ubuntu
 ^^^^^^