Enhance JavaDoc for RepeatOnErrorBuilder#until(String) with examples

**User story**
As a software developer, I would like to have one or more examples in the JavaDoc of `RepeatOnErrorBuilder#until(String)` in order to be able to understand the expected condition syntax.

Locate the JavaDoc for RepeatOnErrorBuilder#until(String) and read the surrounding builder API to understand the expected condition syntax. Add one or more representative condition examples to that JavaDoc; done means the examples clearly show how the String condition should be written.

Written by the indexing model from the issue text.