chore(doc): comment channel routes

src/routes/channels/voice_join.rs

@@ -3,11 +3,17 @@ use revolt_quark::{models::User, Ref, Result};
 use rocket::serde::json::Value;
 use serde::{Deserialize, Serialize};
 
+/// # Token Response
 #[derive(Serialize, Deserialize)]
-struct CreateUserResponse {
+struct CreateVoiceUserResponse {
+    /// Token for authenticating with the voice server
     token: String,
 }
 
+/// # Join Call
+///
+/// Asks the voice server for a token to join the call.
+#[openapi(tag = "Voice")]
 #[post("/<_target>/join_call")]
 pub async fn req(_user: User, _target: Ref) -> Result<Value> {
     unimplemented!()