docs(form): update stories to csf3 for Training Form 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[bot]]

Codecov Report

Merging #1345 (172eff6) into master (2e279a2) will increase coverage by 0.10%. Report is 6 commits behind head on master. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1345      +/-   ##
==========================================
+ Coverage   91.39%   91.49%   +0.10%     
==========================================
  Files          28       55      +27     
  Lines         999     1752     +753     
  Branches      330      515     +185     
==========================================
+ Hits          913     1603     +690     
- Misses         86      149      +63     

see 27 files with indirect coverage changes

[jordan-a-young]

For each of the StoryObj types the type we pass in should match what the story is for since that type is used to generate docs