update broken page references

installation/install.rst

@@ -49,7 +49,7 @@ Rockstor is under continuous development and we generally release updates in
 small batches. These updates are easy to install and distributed in two
 distinct *update channels* described in our :ref:`update_channels` section. On
 rare occasions, we roll-out major releases that require a complete re-install;
-see: :ref:`v3_to_v4` as an example.
+see: :ref:`centos_to_opensuse` as an example.
 
 .. note::
    Would you like to see a specific feature added or updated? Come share your

interface/system/config_backup.rst

@@ -13,7 +13,7 @@ any previously saved point. This is a particularly useful feature when making
 extensive configuration changes as it provides the possibility to revert to a
 known good configuration. Once a configuration backup has been generated and
 downloaded it can also be used in system migration scenarios;
-e.g., see: :ref:`v3_to_v4`.
+e.g., see: :ref:`centos_to_opensuse`.
 
 .. warning::
    Upon restore, the configuration of most features included in the backup