String.get_slice return Raw String

[CsloudX]

Godot version

v4.1.beta2.official [a2575cb]

System information

Windows 10, 64bit

Issue description

String.get_slice() returns an raw string if the slice does not exist, but the docs say:

Steps to reproduce

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Minimal reproduction project

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[AThousandShips]

The documentation is arguably ambiguous here, it doesn't exactly state that it will return empty if no entry matches, only if the specific slice doesn't exist, so it's a matter of interpretation here, and arguably changing the code breaks compatibility, depending on the interpretation, so we can either clarify the documentation or update the code, the former is easier and safer

[timothyqiu]

get_slice() was an internal method and exposed later in #54453. The behavior is the same at that time, so it's the documentation that's wrong.

[AThousandShips]

It's been the same since before open source

Will update the documentation