chore(doc): implement remainder of documentation

src/routes/users/change_username.rs

@@ -5,20 +5,27 @@ use rocket::{serde::json::Json, State};
 use serde::{Deserialize, Serialize};
 use validator::Validate;
 
-#[derive(Validate, Serialize, Deserialize)]
-pub struct Data {
+/// # Username Information
+#[derive(Validate, Serialize, Deserialize, JsonSchema)]
+pub struct DataChangeUsername {
+    /// New username
     #[validate(length(min = 2, max = 32), regex = "RE_USERNAME")]
     username: String,
+    /// Current account password
     #[validate(length(min = 8, max = 1024))]
     password: String,
 }
 
+/// # Change Username
+///
+/// Change your username.
+#[openapi(tag = "User Information")]
 #[patch("/@me/username", data = "<data>")]
 pub async fn req(
     db: &State<Database>,
     account: Account,
     mut user: User,
-    data: Json<Data>,
+    data: Json<DataChangeUsername>,
 ) -> Result<Json<User>> {
     let data = data.into_inner();
     account