DOCS-11357 added versionchanged as per Kay's comment

Author: Amar

source/includes/extracts-wired-tiger.yaml

@@ -183,16 +183,18 @@ content: |
 ---
 ref: wt-snapshot-frequency
 content: |
-   MongoDB configures WiredTiger to create checkpoints (i.e. write the
-   snapshot data to disk) at intervals of 60 seconds.
+   .. versionchanged:: 3.6
+      MongoDB configures WiredTiger to create checkpoints (i.e. write the
+      snapshot data to disk) at intervals of 60 seconds.
 ---
 ref: wt-journal-frequency
 content: |
    - .. versionadded:: 3.2
         Every 50 milliseconds.
 
-   - MongoDB sets checkpoints to occur in WiredTiger on user data at an
-     interval of 60 seconds.
+   - .. versionchanged:: 3.6
+        MongoDB sets checkpoints to occur in WiredTiger on user data at an
+        interval of 60 seconds.
 
    - If the write operation includes a write concern of :writeconcern:`j:
      true <j>`, WiredTiger forces a sync of the WiredTiger journal files.