docs: temporary remove --keep-data from v1 upgrade path

we want to return it back when platform is activated

docs/user/masternodes/dashmate-upgrade-v1.rst

@@ -23,10 +23,9 @@ Install the new dashmate version
    <https://github.com/dashpay/platform/releases/latest>`__. For more details, refer to the
    :ref:`install instructions <evonode-setup-install-dashmate>`.
 
-3. Reset previous services to ensure compatibility with the new version. Use ``--keep-data`` so the
-   existing blockchain is retained::
+3. Reset previous services to ensure compatibility with the new version::
    
-     dashmate reset --keep-data
+     dashmate reset
 
 4. Update services::
    
@@ -43,4 +42,4 @@ Start dashmate node
 
     dashmate status
     dashmate status core
-    dashmate status platform
+    dashmate status platform