remove blurb (#716)

Author: shuangela

source/reference/live-upgrade.txt

@@ -17,13 +17,6 @@ Live Upgrades
    :depth: 2
    :class: singlecol
 
-.. important::
-
-   ``mongosync`` does not support live upgrades to version 1.11 due
-   to the expanded permissions required for ``mongosync`` 1.11. To upgrade to the
-   most recent version, see :ref:`c2c-release-version-numbers`. 
-
-
 Starting in ``mongosync`` 1.7.0, you can live upgrade ``mongosync`` without
 restarting data synchronization operations from the beginning.