add missing use to doctests

ngrok/README.md

@@ -83,7 +83,7 @@ url = "2.5.4"
 ```rust
 #![deny(warnings)]
 use axum::{routing::get, Router};
-use ngrok::config::ForwarderBuilder;
+use ngrok::config::{ForwarderBuilder, TunnelBuilder};
 use std::net::SocketAddr;
 use url::Url;
 

ngrok/src/config/http.rs

@@ -281,6 +281,7 @@ impl HttpTunnelBuilder {
     ///
     /// ```no_run
     /// # use ngrok::Session;
+    /// # use ngrok::config::TunnelBuilder;
     /// # async fn example() -> Result<(), Box<dyn std::error::Error>> {
     /// let session = Session::builder().authtoken_from_env().connect().await?;
     ///

ngrok/src/config/tcp.rs

@@ -146,6 +146,7 @@ impl TcpTunnelBuilder {
     ///
     /// ```no_run
     /// # use ngrok::Session;
+    /// # use ngrok::config::TunnelBuilder;
     /// # async fn example() -> Result<(), Box<dyn std::error::Error>> {
     /// let session = Session::builder().authtoken_from_env().connect().await?;
     ///

ngrok/src/config/tls.rs

@@ -161,6 +161,7 @@ impl TlsTunnelBuilder {
     ///
     /// ```no_run
     /// # use ngrok::Session;
+    /// # use ngrok::config::TunnelBuilder;
     /// # async fn example() -> Result<(), Box<dyn std::error::Error>> {
     /// let session = Session::builder().authtoken_from_env().connect().await?;
     ///