fix(nimble): Revise the help section for the Kconfig macro BLE_RPA_TIMEOUT

components/bt/host/nimble/Kconfig.in

@@ -304,8 +304,7 @@ config BT_NIMBLE_RPA_TIMEOUT
     depends on BT_NIMBLE_ENABLED
     default 900
     help
-        Time interval between RPA address change. This is applicable in case of
-        Host based RPA
+        Time interval between RPA address change.
 
 menuconfig BT_NIMBLE_MESH
     bool "Enable BLE mesh functionality"