fix: simplify assistant key management

apps/docs/docs/management/assistant.mdx

@@ -73,8 +73,8 @@ disabled, unavailable, or returns no models.
 
 API keys and additional header values are encrypted in the Homarr database. They are decrypted only on
 the server for discovery and model requests, and they are never returned to the browser. Changing the
-provider or base URL clears existing credentials unless replacements are submitted with the change. This
-prevents credentials for one service from being sent to another endpoint.
+provider or base URL clears existing credentials. This prevents credentials for one service from being sent
+to another endpoint.
 
 When a key is already stored, the page shows its protected state instead of an ambiguous empty password
 field. Removing the API key requires explicit confirmation. Save that removal before entering and saving a