Change funcref to Callable in example code.

[jomiq]

Small change.
Resolves #6443

[YuriSizov]

These samples need to be rewritten, because there is no point constructing Callables like that. Each function is already a Callable, it can be simply referenced.

[jomiq]

OK,
I just saw #2592. Should I close #6443 and reference that instead?

[YuriSizov]

I don't think that the issue that you've linked has any relevance here, it's from 2019. Callable is a new concept for Godot 4, and it's not just a rename of funcref. Each method of a class is already a Callable, so the examples can use them directly, instead of creating funcrefs. This still needs to be changed, just not the way that you've done it. You can still improve this PR and correct the code samples.

[mhilbrunner]

Fixed in #6542. Thanks for contributing!