Add : to node properties, to differentiate them from node paths

[hakro]

Fixes #93844

It seems that adding a : before a property is mandatory in some cases, and optional in others. So this PR adds it to the doc in order to cover most cases.

An example where this is mandatory is in the MultiplayerSynchronizer.replication_config.add_property (see issue #93844)

On the other hand, the : is optional in Object.get_indexed() and Tween.tween_property()

E.g: those 2 lines yield the same result

get_tree().create_tween().tween_property(self, "position", Vector2(100,100), 5)
get_tree().create_tween().tween_property(self, ":position", Vector2(100,100), 5)

[Mickeon]

Approved already in RocketChat... chat.

As seen by the issue above, It's really worth paying attention to this when both "node" and "property path" matter.

I reiterate briefly for future reference: for some methods (Object.get_indexed(), Tween.tween_property(), etc.), the : prefix can be optionally omitted. This is because these methods only expect their given NodePath to refer to a property, and use get_as_property_path() internally to ensure it does.

Although Godot users are pretty much used to it (it's really nice), this should be seen as an exception, and ideally should be briefly stated for each method that does this.

[dsnopek]

If one form is preferred (and it sounds like including the leading : is preferred, since that's accepted in more places?), it would be nice for the docs to explicitly say that somewhere.

[hakro]

If one form is preferred (and it sounds like including the leading : is preferred, since that's accepted in more places?), it would be nice for the docs to explicitly say that somewhere.

Thank you for the review !
I have added a small paragraph explaining that. Lemme know if you see a better way to word it :)

[dsnopek]

Thanks, that sounds great to me!

[akien-mga]

Thanks!