Update WIT to add note about loading polygons without elevation values

[LaurenSchenk1]

Proposed changes

Include a note in WIT notebook when loading polygons to remove any Z/elevation values

Checklist

(Replace [ ] with [x] to check off)

• [x] Notebook created using the DEA-notebooks template
• [x] Remove any unused Python packages from Load packages
• [x] Remove any unused/empty code cells
• [x] Remove any guidance cells (e.g. General advice)
• [ ] Ensure that all code cells follow the PEP8 standard for code. The jupyterlab_code_formatter tool can be used to format code cells to a consistent style: select each code cell, then click Edit and then one of the Apply X Formatter options (YAPF or Black are recommended).
• [] Include relevant tags in the final notebook cell (refer to the DEA Tags Index, and re-use tags if possible)
• [x] Clear all outputs, run notebook from start to finish, and save the notebook in the state where all cells have been sequentially evaluated
• [ ] Test notebook on both the NCI and DEA Sandbox (flag if not working as part of PR and ask for help to solve if needed)
• [ ] If applicable, update the Notebook currently compatible with the NCI|DEA Sandbox environment only line below the notebook title to reflect the environments the notebook is compatible with
• [x] Check for any spelling mistakes using the DEA Sandbox's built-in spellchecker (double click on markdown cells then right-click on pink highlighted words). For example:

[review-notebook-app[bot]]

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[robbibt]

Hey @LaurenSchenk1, no issues with this and happy to approve, but out of curiousity, do we know what's going wrong here? Seems like a weird one (would have expected WIT to be just using the geometry of the polygons, not any of their fields). Perhaps something that we might want to think about fixing in the WIT code itself (or at least raising some kind of warning/error so it doesn't fail silently)