Misleading description for Callable ==

I'm not actually sure how to improve the description because the behaviour of bound callables is so confusing; thus I'm opening an issue instead of a PR so that more qualified people can share their input.

**Godot version: 4.5 and below**

**Issue description:**

The documentation of the == operator for Callable mentions that `true` is returned if the compared callable invokes the same target - that is, however, not exactly true. The current behavior is the following:
```
print.bind("apple") == print; // false, as expected
print.bind("apple") == print.bind("apple"); // true, for the wrong reasons
print.bind("apple") == print.bind("tomato"); // true as well
print.bind("apple") == print.bind("tomato", "apple"); false
```

When comparing callables, the *amount* of bound arguments is compared, not what they actually are. The documentation *should* inform of this behavior, but I'm not exactly sure how to explain this in a concise manner.

**URL to the documentation page:**

https://docs.godotengine.org/en/stable/classes/class_callable.html#class-callable-operator-eq-callable