removes experimental note from example config (#9195)

docs/pages/setup/reference/config.mdx

@@ -324,18 +324,12 @@ auth_service:
 
     # Optional setting for configuring session recording. Possible values are:
     #    "node"  : sessions will be recorded on the node level  (the default)
+    #    "node-sync" : session recordings will be streamed from node -> auth -> storage service without being stored on disk at all.
     #    "proxy" : recording on the proxy level, see "Recording Proxy Mode"
     #              (https://goteleport.com/docs/architecture/proxy/#recording-proxy-mode).
+    #    "proxy-sync : session recordings will be streamed from proxy -> auth -> storage service without being stored on disk at all.
     #    "off"   : session recording is turned off
     #
-    # EXPERIMENTAL *-sync modes
-    # Proxy and node send logs directly to S3 or other storage without
-    # storing the records on disk at all. *-sync requires all nodes to be
-    # upgraded to 4.4.
-    #
-    #    "node-sync" : session recordings will be streamed from node -> auth -> storage service
-    #    "proxy-sync : session recordings will be streamed from proxy -> auth -> storage service
-    #
     session_recording: "node"
 
     # This setting determines if a Teleport proxy performs strict host key checks.