Fix import in doctest example

[robert-s-lee]

What does this PR do?

refactoring was done at some point to move Dict and List to

• lightning/src/lightning_app/structures/list.py and
• lightning/src/lightning_app/structures/dict.py

The doctest inside code still reflects the old structure, and cut/paste of examples no longer works.

update the doctest to reflect the new lightning_app.structures

Does your PR introduce any breaking changes? If yes, please list them.

None

Before submitting

• Was this discussed/approved via a GitHub issue? (not for typos and docs)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure your PR does only one thing, instead of bundling different changes together?
• Did you make sure to update the documentation with your changes? (if necessary)
• Did you write any new necessary tests? (not for typos and docs)
• Did you verify new and existing tests pass locally with your changes?
• Did you list all the breaking changes introduced by this pull request?
• Did you update the CHANGELOG? (not for typos, docs, test updates, or minor internal changes/refactors)

PR review

Anyone in the community is welcome to review the PR.
Before you start reviewing, make sure you have read the review guidelines. In short, see the following bullet-list:

• Is this pull request ready for review? (if not, please submit in draft mode)
• Check that all items from Before submitting are resolved
• Make sure the title is self-explanatory and the description concisely explains the PR
• Add labels and milestones (and optionally projects) to the PR so it can be classified

Did you have fun?

Make sure you had fun coding 🙃

[awaelchli]

LGTM
more work needs to be done in the future to fix these imports properly

[carmocca]

@Borda I believe this was incorrectly milestoned.