update stable release

Author: kay-kim

source/release-notes.txt

@@ -9,32 +9,23 @@ Always install the latest, stable version of MongoDB. See
 See the following release notes for an account of the changes in major
 versions. Release notes also include instructions for upgrade.
 
-Current Development Release
-~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-(*3.0-series*)
-
-.. toctree::
-   :maxdepth: 1
-
-   /release-notes/3.0
-
 Current Stable Release
 ~~~~~~~~~~~~~~~~~~~~~~
 
-(*2.6-series*)
+(*3.0-series*)
 
 .. toctree::
    :maxdepth: 1
 
-   /release-notes/2.6
+   /release-notes/3.0
 
 Previous Stable Releases
 ~~~~~~~~~~~~~~~~~~~~~~~~
 
 .. toctree::
    :maxdepth: 1
 
+   /release-notes/2.6
    /release-notes/2.4
    /release-notes/2.2
    /release-notes/2.0