Update attachables.json added improved documentation of sound_effects + fixed a bug.

[StealthyExpertX]

Update attachables.json and add improved documentation of sound_effects.

Fixed a bug where the data type was an array and it should have been an object causing it to be invalid when added.

[DaanV2]

@StealthyExpertX

[Xterionix]

{
    "sound_effects":{
        "type":"object",
        "minProperties":1,
        "additionalProperties":{
            "type":"string",
            "description":"A single sound effect reference.",
            "title":"Sound Effects"
        },
        "description":"A collection of sound effect references.",
        "title":"Sound Effects"
    }
}

This is what's changed incase someone wants to fix it before I get the time to do so