Update raft.mdx (#23001)

* Update raft.mdx
---------

Co-authored-by: Sarah Chavis <62406755+schavis@users.noreply.github.com>

website/content/docs/configuration/storage/raft.mdx

@@ -74,7 +74,8 @@ delay) mode. The maximum allowed value is 10.
   snapshot size and high write throughput causing log truncation before a
   snapshot can be fully installed. If you need to use this to recover a cluster,
   consider reducing write throughput or the amount of data stored on Vault. The
-  default value is 10000 which is suitable for all normal workloads.
+  default value is 10000 which is suitable for all normal workloads. The
+  `trailing_logs` metric is not the same as `max_trailing_logs`.
 
 - `snapshot_threshold` `(integer: 8192)` - This controls the minimum number of Raft
   commit entries between snapshots that are saved to disk. This is a low-level
@@ -86,6 +87,13 @@ delay) mode. The maximum allowed value is 10.
   snapshot. Servers may take longer to recover from crashes or failover if this
   is increased significantly as more logs will need to be replayed.
 
+- `snapshot_interval` `(integer: 120 seconds)` - The snapshot interval
+   controls how often Raft checks whether a snapshot operation is
+   required. Raft randomly staggers snapshots between the configured
+   interval and twice the configured interval to keep the entire cluster
+   from performing a snapshot at once. The default snapshot interval is
+   120 seconds.
+
 - `retry_join` `(list: [])` - There can be one or more
   [`retry_join`](#retry_join-stanza) stanzas. When the Raft cluster is getting
   bootstrapped, if the connection details of all the nodes are known beforehand,