fix link to namespace rules section in dashboard

Author: mclark-ably

src/pages/docs/channels/index.mdx

@@ -207,9 +207,9 @@ To set a rule:
 <Tabs>
 <Tab value="dashboard" label="Dashboard">
 
-In your app [settings](https://ably.com/accounts/any/apps/any/settings):
+In your app [settings](https://ably.com/accounts/any/apps/any/app_namespaces):
 
-1. Click **Add new rule**.
+1. Click **Create rule**.
 2. Select the channel name or namespace to apply rules to.
 3. Check the required rules.
 4. Click **Create rule** to save.