chore(doc): implement remainder of documentation

src/routes/users/add_friend.rs

@@ -4,6 +4,10 @@ use revolt_quark::{Database, Result};
 use rocket::serde::json::Json;
 use rocket::State;
 
+/// # Send Friend Request / Accept Request
+///
+/// Send a friend request to another user or accept another user's friend request.
+#[openapi(tag = "Relationships")]
 #[put("/<username>/friend")]
 pub async fn req(db: &State<Database>, user: User, username: String) -> Result<Json<User>> {
     let mut target = db.fetch_user_by_username(&username).await?;