### 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
from_signal->set_text(p_for_signal);
	error_label->add_theme_color_override("font_color", error_label->get_theme_color(SNAME("error_color"), SNAME("Editor")));
	filter_nodes->clear();
	if (!advanced->is_pressed()) {
		error_label->set_visible(!_find_first_script(get_tree()->get_edited_scene_root(), get_tree()->get_edited_scene_root()));
	}
	if (first_popup) {
		first_popup = false;
		_advanced_pressed();
	}
	popup_centered();
}
void ConnectDialog::_advanced_pressed() {
	if (advanced->is_pressed()) {
		connect_to_label->set_text(TTR("Connect to Node:"));
		tree->set_connect_to_script_mode(false);
		vbc_right->show();
		error_label->hide();
	} else {
		reset_size();
		connect_to_label->set_text(TTR("Connect to Script:"));
		tree->set_connect_to_script_mode(true);
		vbc_right->hide();
		error_label->set_visible(!_find_first_script(get_tree()->get_edited_scene_root(), get_tree()->get_edited_scene_root()));
	}
	EditorSettings::get_singleton()->set_project_metadata("editor_metadata", "use_advanced_connections", advanced->is_pressed());
	popup_centered();
}
ConnectDialog::ConnectDialog() {