doc: update stability status for diagnostics_channel to experimental

PR-URL: https://github.com/nodejs/node/pull/58261
Fixes: https://github.com/nodejs/node/issues/58234
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Edy Silva <edigleyssonsilva@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>

doc/api/diagnostics_channel.md

@@ -1103,14 +1103,10 @@ for the sync error and one for the async error.
 
 ### Built-in Channels
 
-> Stability: 1 - Experimental
-
-While the diagnostics\_channel API is now considered stable, the built-in
-channels currently available are not. Each channel must be declared stable
-independently.
-
 #### Console
 
+> Stability: 1 - Experimental
+
 `console.log`
 
 * `args` {any\[]}
@@ -1148,6 +1144,8 @@ passed to `console.error()`.
 
 #### HTTP
 
+> Stability: 1 - Experimental
+
 `http.client.request.created`
 
 * `request` {http.ClientRequest}
@@ -1203,6 +1201,8 @@ Emitted when server sends a response.
 
 #### HTTP/2
 
+> Stability: 1 - Experimental
+
 `http2.client.stream.created`
 
 * `stream` {ClientHttp2Stream}
@@ -1212,6 +1212,8 @@ Emitted when a stream is created on the client.
 
 #### Modules
 
+> Stability: 1 - Experimental
+
 `module.require.start`
 
 * `event` {Object} containing the following properties
@@ -1264,6 +1266,8 @@ Emitted when a `import()` throws an error. See [`error` event][].
 
 #### NET
 
+> Stability: 1 - Experimental
+
 `net.client.socket`
 
 * `socket` {net.Socket}
@@ -1298,6 +1302,8 @@ Emitted when [`net.Server.listen()`][] is returning an error.
 
 #### UDP
 
+> Stability: 1 - Experimental
+
 `udp.socket`
 
 * `socket` {dgram.Socket}
@@ -1306,6 +1312,8 @@ Emitted when a new UDP socket is created.
 
 #### Process
 
+> Stability: 1 - Experimental
+
 <!-- YAML
 added: v16.18.0
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@@ -1326,6 +1334,8 @@ Emitted when [`process.execve()`][] is invoked.
 
 #### Worker Thread
 
+> Stability: 1 - Experimental
+
 <!-- YAML
 added: v16.18.0
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