Document/clarify the execution order of multiple functions `await`-ing the same signal callback (Seems to preserve order).

**NOTE: `get_tree().physics_frame.connect(_printing_func, CONNECT_ONE_SHOT)` executes in the same order as `await`-ing.**

---

**Your Godot version:**

3.5.3.stable, 4.1.3.stable, and 4.2.stable

**Issue description:**

From what I see, the order is **always preserved**.

Attach script to all nodes:

- Root
- A
- B

```gdscript
extends Node

func _enter_tree() -> void:
await get_tree().physics_frame
print("_enter_tree: ", name)

func _ready() -> void:
await get_tree().physics_frame
print("_ready: ", name)
```

And this should "work" with both process_frame and physics_frame

Output in 3.5.3.stable, 4.1.3.stable, and 4.2.beta6:

```
_enter_tree: Root
_enter_tree: A
_enter_tree: B
_ready: A
_ready: B
_ready: Root
```

This order might break if an underlying data structure changes.

MRP:
[godot3_test1.zip](https://github.com/godotengine/godot-docs/files/13361048/godot3_test1.zip) uses yield instead
Godot 4: [test2.zip](https://github.com/godotengine/godot-docs/files/13361053/test2.zip)

**URL to the documentation page (if already existing):**