### Godot version

v4.1.1.stable.official [bd6af8e0e]

### System information

v4.1.1.stable.official [bd6af8e0e]

### Issue description

In-script documentation (`##`) for `signal` members is not appearing in the _Node_ tab as expected.  Other documentation appears to work correctly in the _Inspector_ tab.

Working example (exported variable):
![GodotDocumentationWorking](https://github.com/godotengine/godot/assets/13528480/ab9b19d4-c9f7-4658-8379-f2c2699310b8)

Non-working example (`signal`)
![GodotDocumentationNotWorking](https://github.com/godotengine/godot/assets/13528480/06824f6a-b135-4454-a06e-7c6feb34060b)

I have tried deselecting and reselecting the associated Node, changing between the tabs on the left pane, changing active scripts and even restarting Godot - nothing makes it work.  According to the [GScript Documentation on Documentation Comments](https://docs.godotengine.org/en/stable/tutorials/scripting/gdscript/gdscript_documentation_comments.html), this **should** work, right?  Or is there something completely obvious that I am missing?


### Steps to reproduce

1. In Godot, create a new Node of type `Node`
2. Attach a new script to this Node, accepting all current defaults
3. In the script editor create a `signal` called `Foo` and right above it, create a `##` comment for it
4. Also create an `@export`ed integer variable called `Bar` and also create a `##` comment for it
5. Unselect and reselect the Node in the _Scene_ tab to refresh the _Inspector_ and _Node_ tabs
6. Hover over the variable in the _Inspector_ tab and see that the added description is shown correctly
7. Hover over the signal in the _Node_ tab and see that the added description is **not** shown and "_No description._" is shown instead

This is an example of the script that could be added:
```
## This is signal foo!
signal Foo

## This is exported signal bar!
@export var Bar : int = 0
```

### Minimal reproduction project

N/A
set_min_size(Size2(0, 500) * EDSCALE);
	HBoxContainer *main_hb = memnew(HBoxContainer);
	add_child(main_hb);
	VBoxContainer *vbc_left = memnew(VBoxContainer);
	main_hb->add_child(vbc_left);
	vbc_left->set_h_size_flags(Control::SIZE_EXPAND_FILL);
	vbc_left->set_custom_minimum_size(Vector2(400 * EDSCALE, 0));
	from_signal = memnew(LineEdit);
	vbc_left->add_margin_child(TTR("From Signal:"), from_signal);
	from_signal->set_editable(false);
	tree = memnew(SceneTreeEditor(false));
	tree->set_connecting_signal(true);
	tree->set_show_enabled_subscene(true);
	tree->set_v_size_flags(Control::SIZE_FILL | Control::SIZE_EXPAND);
	tree->get_scene_tree()->connect("item_activated", callable_mp(this, &ConnectDialog::_item_activated));
	tree->connect("node_selected", callable_mp(this, &ConnectDialog::_tree_node_selected));
	tree->set_connect_to_script_mode(true);
	HBoxContainer *hbc_filter = memnew(HBoxContainer);