add some doc comments

src/world/room.rs

@@ -9,17 +9,30 @@ use crate::id::Id;
 use crate::try_log;
 use crate::world::{Area, AreaType, Direction, Exit, DIRECTION_LIST};
 
+/// A specific location in the world.
 #[derive(Debug, Deserialize, Serialize)]
 pub struct Room {
+	/// Unique identifier
 	pub id: Id,
+
+	/// Parent zone that the room is in
 	pub zone: Id,
+
+	/// Name of the room
 	pub name: String,
+
+	/// Description, each line an entry in a `Vec`
 	pub description: Vec<String>,
+
+	/// Whether users in the room should be visible to the parent zone
 	pub users_visible: bool,
+
+	/// Exits from the room
 	pub exits: HashMap<Direction, Exit>,
 }
 
 impl Room {
+	/// Return a list of available exits by the short identifier
 	pub fn exit_string(&self) -> String {
 		if self.exits.is_empty() {
 			return String::new();