Guidance Hint example for ODK Collect

A proposed implementation of [hint guidance](https://opendatakit.github.io/xforms-spec/#languages) that's being reviewed in this [PR ](https://github.com/opendatakit/collect/pull/2105 )would require that the ODK collect tutorials reflect an example of how to add this functionality to a form and how to trigger how it's displayed such as it being collapsed or always visible.

Read the linked XForms hint guidance and the ODK Collect PR 2105 first, then search the tutorials for the form examples that should be updated. Add an example showing how to enable hint guidance and trigger its collapsed or always-visible display, and verify the documentation builds correctly.

Written by the indexing model from the issue text.