[BUG] Complete user guide entry for search_data and search_datasets

[andypbarrett]

Is this issue already tracked somewhere, or is this a new report?

• I've reviewed existing issues and couldn't find a duplicate for this problem.

Current Behavior

The User Guide section for Search does not have complete descriptions for search_data and search_datasets.

Expected Behavior

User Guide for search_data and search_datasets should have complete description of these methods including a complete documentation and description of keywords used for searching, including examples.

Steps To Reproduce

See Search

Environment

- OS:
- Python:

Additional Context

No response