update doc for market_depth (#222)

Co-authored-by: Wil Boayue <[email protected]>

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ibapi"
-version = "1.0.15"
+version = "1.0.16"
 edition = "2021"
 authors = ["Wil Boayue <[email protected]>"]
 description = "A Rust implementation of the Interactive Brokers TWS API, providing a reliable and user friendly interface for TWS and IB Gateway. Designed with a focus on simplicity and performance."

src/client.rs

@@ -1188,13 +1188,21 @@ impl Client {
     ///
     /// ```no_run
     /// use ibapi::Client;
+    /// use ibapi::contracts::Contract;
     /// use ibapi::market_data::{MarketDataType};
     ///
     /// let client = Client::connect("127.0.0.1:4002", 100).expect("connection failed");
     ///
-    /// let market_data_type = MarketDataType::Live;
-    /// client.switch_market_data_type(market_data_type).expect("request failed");
-    /// println!("market data switched: {:?}", market_data_type);
+    /// let contract = Contract::stock("AAPL");
+    ///
+    /// let subscription = client.market_depth(&contract, 5, true).expect("error requesting market depth");
+    /// for row in &subscription {
+    ///     println!("row: {row:?}");
+    /// }
+    ///
+    /// if let Some(error) = subscription.error() {
+    ///     println!("error: {:?}", error);
+    /// }
     /// ```
     pub fn market_depth<'a>(
         &'a self,

src/client/tests.rs

@@ -4,11 +4,13 @@ use crate::{stubs::MessageBusStub, transport::ConnectionMetadata};
 
 use super::Client;
 
-
 #[test]
 fn test_client_id() {
     let client_id = 500;
-    let connection_metadata = ConnectionMetadata{client_id, ..ConnectionMetadata::default()};
+    let connection_metadata = ConnectionMetadata {
+        client_id,
+        ..ConnectionMetadata::default()
+    };
     let message_bus = Arc::new(MessageBusStub::default());
 
     let client = Client::new(connection_metadata, message_bus).unwrap();