Updated C# example of AddPropertyInfo

[vitormaduro]

Currently, the C# example of the method AddPropertyInfo looks like this:

var propertyInfo = new Godot.Collections.Dictionary
		{
			{"name", "category/propertyName"},
			{"type", Variant.Type.Int},
			{"hint", PropertyHint.Enum},
			{"hint_string", "one,two,three"},
		};

However, the code above produces an error if copied exactly, because Godot cannot convert a Variant.Type or a PropertyHint variable into a Variant one. Casting both variables to int fixes the issue:

var propertyInfo = new Godot.Collections.Dictionary
		{
			{"name", "category/propertyName"},
			{"type", (int)Variant.Type.Int},
			{"hint", (int)PropertyHint.Enum},
			{"hint_string", "one,two,three"},
		};

[raulsntos]

Thanks for contributing to the .NET documentation! Since this is your first PR, make sure to read CONTRIBUTING.md.

You'll have to squash the commits into one, you can see how in the PR workflow documentation page. If you need help, feel free to reach out in Rocket Chat.

Also, please amend the commit message to something more descriptive.

[vitormaduro]

Oops, sorry for that. I updated the commit message and squashed both commits into a single one

[raulsntos]

LGTM!

[akien-mga]

Thanks! And congrats for your first merged Godot contribution 🎉

[YuriSizov]

Cherry-picked for 4.1.3.