fix document added to incorrect version

Author: xiaokangwang

docs/en_US/config/service/backgroundObservatory.md

@@ -14,8 +14,3 @@ The URL to send probe request to.
 > `probeInterval`: number
 
 The time between each probe in second.
-
-> `persistentProbeResult`: bool
-
-Whether to store probe result in persistent storage. (v5.27.0+)
-This requires persistent storage support.

docs/en_US/v5/config/service/backgroundObservatory.md

@@ -14,3 +14,8 @@ The URL to send probe request to.
 > `probeInterval`: number
 
 The time between each probe in second.
+
+> `persistentProbeResult`: bool
+
+Whether to store probe result in persistent storage. (v5.27.0+)
+This requires persistent storage support.