ref(replays): update replay_type searchable prop (#13130)

* ref(replays): update replay_type searchable prop

* error -> buffer

Author: aliu39

docs/concepts/search/searchable-properties/session-replay.mdx

@@ -226,9 +226,9 @@ A release is a version of your code deployed to an environment. You can create a
 
 - **Type:** string
 
-### `replayType`
+### `replay_type`
 
-The reason a replay was triggered. For example, `session` when `replaysSessionSampleRate` takes effect, or `error` when `replaysOnErrorSampleRate` is sampled instead of `session`.
+The reason a replay was triggered. For example, `session` when `replaysSessionSampleRate` takes effect, or `buffer` when `replaysOnErrorSampleRate` is sampled instead of `session`. Learn more in the [Session Replay docs](/platforms/javascript/session-replay/understanding-sessions/).
 
 - **Type:** string