DOCS-16652 Adds Reversing State (#282) (#354)

* DOCS-16652 New mongosync states

* Fixes per Tim

* Fixes spacing

* Fixes per Nick



* Fixes per Huan

* Fixes per Huan

---------

Co-authored-by: Nick Villahermosa <nick.villahermosa@mongodb.com>

Author: kennethdyer

source/reference/mongosync-states.txt

@@ -85,5 +85,16 @@ operations in that state.
        ``COMMITTED``
      - The cutover for the sync process is complete.
      - - ``GET`` :ref:`/progress <c2c-api-progress>`
-       - ``GET`` :ref:`/reverse <c2c-api-reverse>`
+       - ``POST`` :ref:`/reverse <c2c-api-reverse>`
+
+   * - .. _c2c-state-reversing:
+
+       ``REVERSING``
+
+     - The sync process copies metadata from the destination
+       cluster to the source cluster. Then, MongoDB swaps the
+       source and destination clusters and resumes applying
+       change events.
+
+     - - ``GET`` :ref:`/progress <c2c-api-progress>`