RATIS-2052. Add docs for triggering snapshot when removing raftGroup parameter. (#1061)

diff --git a/ratis-docs/src/site/markdown/configurations.md b/ratis-docs/src/site/markdown/configurations.md
index 7c8fb00..95505fd 100644
--- a/ratis-docs/src/site/markdown/configurations.md
+++ b/ratis-docs/src/site/markdown/configurations.md
@@ -494,6 +494,11 @@
 | **Type**        | boolean                                            |
 | **Default**     | true                                               |
 
+| **Property**    | `raft.server.snapshot.trigger-when-remove.enabled`      |
+|:----------------|:--------------------------------------------------------|
+| **Description** | whether to trigger snapshot when raft server is removed |
+| **Type**        | boolean                                                 |
+| **Default**     | true                                                    |
 
 | **Property**    | `raft.server.snapshot.creation.gap`                  |
 |:----------------|:-----------------------------------------------------|