message: Bind ConnectionOptions to their own variables in a couple doctests
diff: @@ -143,7 +143,8 @@ impl ConnectionOptions<options_typestate::NoAuth> {
  /// # Example
  /// ```
  /// # fn main() -> std::io::Result<()> {
  - /// let nc = nats::ConnectionOptions::new().connect("demo.nats.io")?;
  + /// let options = nats::ConnectionOptions::new();
  + /// let nc = options.connect("demo.nats.io")?;
  /// # Ok(())
  /// # }
  /// ```
  @@ -247,7 +248,8 @@ impl<TypeState> ConnectionOptions<TypeState> {
  /// # Example
  /// ```
  /// # fn main() -> std::io::Result<()> {
  - /// let nc = nats::ConnectionOptions::new().connect("demo.nats.io")?;
  + /// let options = nats::ConnectionOptions::new();
  + /// let nc = options.connect("demo.nats.io")?;
  /// # Ok(())
  /// # }
  /// ```
  