Add Best practices to more Polaris docs

[davejcameron]

Background

Adding more information on how to use a number of components. This should help with users understanding how to interact with these components better.

[github-actions]

We detected some changes in packages/*/package.json or packages/*/src, and there are no updates in the .changeset directory. If the changes are user-facing and should cause a version bump, run yarn changeset to track your changes and include them in the next release CHANGELOG. If you are making simple updates to repo configuration, examples, or documentation, you do not need to add a changeset.

[davebcn87]

so nice!