Make ParameterChoice constructor public

[LXGaming]

Description

This PR changes the ParameterChoice constructor from internal to public, this is necessary so that a ParameterChoice can be manually constructed for SlashCommandParameterBuilder.WithChoices.

Changes

• Changed constructor visibility from internal to public.
• Documented the constructor.

Related Issues

[Misha-133]

Hey!
That's an internal type for the Discord.Interactions builders. Those serve a different purpose compared to ones from the Discord namespace. You are likely confusing them together

[LXGaming]

I'm attempting to use the builders to manually construct interactions.

await InteractionService.CreateModuleAsync("Example", null, moduleBuilder => {
    moduleBuilder.AddSlashCommand(slashCommandBuilder => {
        slashCommandBuilder.AddParameter(slashCommandParameterBuilder => {
            slashCommandParameterBuilder.WithChoices(new ParameterChoice("Hello", "World?")); // Impossible due to internal constructor.
        });
    });
});