### 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
switch (p_what) {
		case NOTIFICATION_ENTER_TREE: {
			bind_editor->edit(cdbinds);
			[[fallthrough]];
		}
		case NOTIFICATION_THEME_CHANGED: {
			for (int i = 0; i < type_list->get_item_count(); i++) {
				String type_name = Variant::get_type_name((Variant::Type)type_list->get_item_id(i));
				type_list->set_item_icon(i, get_theme_icon(type_name, SNAME("EditorIcons")));
			}
			Ref<StyleBox> style = get_theme_stylebox("normal", "LineEdit")->duplicate();
			if (style.is_valid()) {
				style->set_content_margin(SIDE_TOP, style->get_content_margin(SIDE_TOP) + 1.0);
				from_signal->add_theme_style_override("normal", style);
			}
			method_search->set_right_icon(get_theme_icon("Search", "EditorIcons"));
			open_method_tree->set_icon(get_theme_icon("Edit", "EditorIcons"));
		} break;
	}
}
void ConnectDialog::_bind_methods() {
	ADD_SIGNAL(MethodInfo("connected"));
}
Node *ConnectDialog::get_source() const {