docs(spaces): update stories to csf3 for Spaces component

[ncruz-av]

Before submitting a pull request, please make sure the following is done:

1. Fork the repository and create your branch from master.
2. Run yarn in the repository root.
3. If you've fixed a bug or added code that should be tested, add tests!
4. Ensure the test suite passes (yarn test). Tip: yarn test --watch TestName is helpful in development.
5. Make sure your code passed the conventional commits check. Read more about conventional commits

[codecov]

Codecov Report

Merging #1337 (80e1d49) into master (6bd8ed7) will decrease coverage by 0.35%.
Report is 2 commits behind head on master.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1337      +/-   ##
==========================================
- Coverage   94.50%   94.16%   -0.35%     
==========================================
  Files          26       17       -9     
  Lines         856      600     -256     
  Branches      293      195      -98     
==========================================
- Hits          809      565     -244     
+ Misses         47       35      -12     

see 9 files with indirect coverage changes