Fix new linting errors

[josecelano]

The new Clippy version forces you to use indentation and also use the > marker in a multiline paragraph. For example:

Not valid because of the missing markers > and the indentation:

//! > **NOTICE**: The server must be running before running the tests. The
//! server url is hardcoded to `http://localhost:3001` for now. We are planning
//! to make it configurable in the future via a environment variable.
//!

Valid:

//! > **NOTICE**: The server must be running before running the tests. The
//! > server url is hardcoded to `http://localhost:3001` for now. We are planning
//! > to make it configurable in the future via a environment variable.
//!

[josecelano]

ACK e0d56a4