Update source/tutorial/install-mongodb-on-debian-or-ubuntu-linux.txt

Inserting mongodb20-10gen package

Author: Gábor Tóth

source/tutorial/install-mongodb-on-debian-or-ubuntu-linux.txt

@@ -39,16 +39,20 @@ configuration and operation.
 Package Options
 ---------------
 
-The 10gen repository contains two packages:
+The 10gen repository contains three packages:
 
 - ``mongodb-10gen``
 
   This package contains the latest **stable** release. Use this for
   production deployments.
 
+- ``mongodb20-10gen``
+
+  This package contains the stable release of v2.0 branch.
+
 - ``mongodb18-10gen``
 
-  This package contains the previous stable release.
+  This package contains the stable release of v1.8 branch.
 
 You cannot install these packages concurrently with each other or with
 the ``mongodb`` package that your release of Debian or Ubuntu may