message: add e2e session.delay explainer
diff: @@ -31,8 +31,10 @@ module.exports = async function signup(session, username, password, homeserver)
  // accept homeserver
  await nextButton.click();
  }
  - //fill out form
  + // Delay required because of local race condition on macOs
  + // Where the form is not query-able despite being present in the DOM
  await session.delay(100);
  + //fill out form
  const usernameField = await session.query("#mx_RegistrationForm_username");
  const passwordField = await session.query("#mx_RegistrationForm_password");
  const passwordRepeatField = await session.query("#mx_RegistrationForm_passwordConfirm");
  