### 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_hide_on_ok(false);
	source = static_cast<Node *>(p_cd.source);
	signal = p_cd.signal;
	signal_args = p_signal_args;
	tree->set_selected(nullptr);
	tree->set_marked(source, true);
	if (p_cd.target) {
		set_dst_node(static_cast<Node *>(p_cd.target));
		set_dst_method(p_cd.method);
	}
	_update_ok_enabled();
	bool b_deferred = (p_cd.flags & CONNECT_DEFERRED) == CONNECT_DEFERRED;
	bool b_oneshot = (p_cd.flags & CONNECT_ONE_SHOT) == CONNECT_ONE_SHOT;
	deferred->set_pressed(b_deferred);
	one_shot->set_pressed(b_oneshot);
	unbind_count->set_max(p_signal_args.size());
	unbind_count->set_value(p_cd.unbinds);
	_unbind_count_changed(p_cd.unbinds);
	cdbinds->params.clear();
	cdbinds->params = p_cd.binds;
	cdbinds->notify_changed();
	edit_mode = p_edit;
	source_connection_data = p_cd;
}
void ConnectDialog::popup_dialog(const String p_for_signal) {