System managed fields separated into new endpoint

docs/api/supervisor/endpoints.md

@@ -278,9 +278,7 @@ Get the add-on logo
 </ApiEndpoint>
 
 <ApiEndpoint path="/addons/<addon>/options" method="post">
-Set the protection mode on an add-on.
-
-This function is not callable by itself and you can not use `self` as the slug here.
+Set the options for an add-on.
 
 :::tip
 To reset customized network/audio/options, set it `null`.
@@ -298,8 +296,6 @@ To reset customized network/audio/options, set it `null`.
 | audio_input                 | float or null | The index of the audio input device     |
 | ingress_panel               | boolean       | `true` if ingress_panel is enabled      |
 | watchdog                    | boolean       | `true` if watchdog is enabled           |
-| system_managed              | boolean       | `true` if managed by Home Assistant     |
-| system_managed_config_entry | boolean       | ID of config entry managing addon       |
 
 **You need to supply at least one key in the payload.**
 
@@ -321,6 +317,31 @@ To reset customized network/audio/options, set it `null`.
 
 </ApiEndpoint>
 
+<ApiEndpoint path="/addons/<addon>/sys_options" method="post">
+Change options specific to system managed addons.
+
+This endpoint is only callable by Home Assistant and not by any other client.
+
+**Payload**
+
+| key                         | type          | description                             |
+| --------------------------- | ------------- | --------------------------------------- |
+| system_managed              | boolean       | `true` if managed by Home Assistant     |
+| system_managed_config_entry | boolean       | ID of config entry managing addon       |
+
+**You need to supply at least one key in the payload.**
+
+**Example payload:**
+
+```json
+{
+  "system_managed": true,
+  "system_managed_config_entry": "abc123"
+}
+```
+
+</ApiEndpoint>
+
 <ApiEndpoint path="/addons/<addon>/options/validate" method="post">
 Run a configuration validation against the current stored add-on configuration or payload.