docs: storybook fixes for list-group-item

[AndrewClarke05]

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 #1333 (092350b) into master (434790f) will increase coverage by 2.72%. Report is 34 commits behind head on master. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1333      +/-   ##
==========================================
+ Coverage   91.72%   94.44%   +2.72%     
==========================================
  Files          59       20      -39     
  Lines        1824      630    -1194     
  Branches      523      202     -321     
==========================================
- Hits         1673      595    -1078     
+ Misses        151       35     -116     

see 75 files with indirect coverage changes