Modify ...

### Description of the modifications

DataProviderResultDataSetCollection uses element_names collection for column names. Example on the page calls property elements

### Useful links and references

https://stk.docs.pyansys.com/version/stable/api/ansys/stk/core/stkobjects/DataProviderResultDataSetCollection.html#ansys.stk.core.stkobjects.DataProviderResultDataSetCollection

Start with the linked DataProviderResultDataSetCollection API page and compare its example with the element_names property described in the issue. Update the example to use the correct property, then verify that the rendered page consistently shows the intended column-name access.

Written by the indexing model from the issue text.