README doctests: fix arti-client

Add ,ignore to ignore three examples that don't actually compile.

cargo readme would add these annotations to lib.rs, but the doc
include doesn't do stuff like that.  pandoc seems to still render the
result just fine.

crates/arti-client/README.md

@@ -53,7 +53,7 @@ This state gets persisted to the locations specified in the
 (This method requires you to initialize the client in an `async fn`.
 Consider using the builder method, below, if that doesn't work for you.)
 
-```rust
+```rust,ignore
 // The client configuration describes how to connect to the Tor network,
 // and what directories to use for storing persistent state.
 let config = TorClientConfig::default();
@@ -74,7 +74,7 @@ bootstrap (or having to use an `await`). This can be done by making a
 The returned client can be made to bootstrap when it is first used (the
 default), or not; see [`BootstrapBehavior`] for more details.
 
-```rust
+```rust,ignore
 // Specifying `BootstrapBehavior::OnDemand` means the client will automatically
 // bootstrap when it is used. `Manual` exists if you'd rather have full control.
 let tor_client = TorClient::builder()
@@ -93,7 +93,7 @@ those traits if the `tokio` crate feature is enabled.
 
 ### Example: making connections over Tor
 
-```rust
+```rust,ignore
 #
 // Initiate a connection over Tor to example.com, port 80.
 let mut stream = tor_client.connect(("example.com", 80)).await?;