* <ul>
* <li>Exactly one of {@link #randomId()} or {@link #withId(String)} must
* have been called.</li>
- * <li>The {@link #from(Sone) sender} must not be {@code null}.</li>
+ * <li>The {@link #from(String) sender} must not be {@code null}.</li>
* <li>Exactly one of {@link #currentTime()} or {@link #withTime(long)} must
* have been called.</li>
* <li>The {@link #withText(String) text} must not be {@code null} and must