Add beta label to remotecfg (#6349)

Signed-off-by: Paschalis Tsilias <[email protected]>

docs/sources/flow/reference/config-blocks/remotecfg.md

@@ -10,7 +10,7 @@ menuTitle: remotecfg
 title: remotecfg block
 ---
 
-# remotecfg block
+# remotecfg block (beta)
 
 `remotecfg` is an optional configuration block that enables {{< param "PRODUCT_NAME" >}}
 to fetch and load the configuration from a remote endpoint.
@@ -20,7 +20,12 @@ configuration file.
 The [API definition][] for managing and fetching configuration that the
 `remotecfg` block uses is available under the Apache 2.0 license.
 
+> **BETA**: The `remotecfg` enables beta functionality.
+> Beta features are subject to breaking changes, and may be replaced with
+> equivalent functionality that cover the same use case.
+
 [API definition]: https://github.com/grafana/agent-remote-config
+[beta]: {{< relref "../../../stability.md#beta" >}}
 
 ## Example