[DOC] Regex utils `ends_with` and `contains` mentioned in docs but are not implemented

The docs for the effects API mention the following:

```md
 regex patterns for common use cases, include `starts_with`, `ends_with`, `contains`, and `no_input_columns`.
```

However, currently only the following are implemented:

```python
__all__ = ["starts_with", "exact", "no_input_columns"]
```