DOCS-9537: resyncFrom behavior

Author: kay-kim

source/includes/extracts-syncFrom.yaml

@@ -3,14 +3,17 @@ content: |
    Sync Logic
    ~~~~~~~~~~
 
-   Only modify the default sync logic as needed, and always exercise
-   caution. {{syncfrom}} will not affect an in-progress initial sync
-   operation. To affect the sync target for the initial sync, run
-   {{syncfrom}} operation *before* initial sync.
+   .. versionchanged:: 3.4
+
+   If an initial sync operation is in progress when you run
+   {{syncfrom}}, {{syncfrom}} stops the in-progress initial sync and
+   restarts the sync process with the new target. In previous versions,
+   if you run {{syncfrom}} during initial sync, MongoDB produces no
+   error messages, but the sync target will not change until after the
+   initial sync operation.
 
-   If you run {{syncfrom}} during initial sync, MongoDB
-   produces no error messages, but the sync target will not change until
-   after the initial sync operation.
+   Only modify the default sync logic as needed, and always exercise
+   caution. 
 
    Target
    ~~~~~~
@@ -34,10 +37,6 @@ content: |
    behind the current member, :program:`mongod` will log a warning but will
    still replicate from the lagging member.
 
-   If you run {{syncfrom}} during initial sync, MongoDB produces no error
-   messages, but the sync target will not change until after the initial
-   sync operation.
-
    Persistence
    ~~~~~~~~~~~