Check docs are up to date

Please check if your documentation files are still up-to-date.

The key documentation files to check are:

- `docs/ABOUT.md`
- `docs/INSTALLATION.md`
- `docs/LEARNING.md`
- `docs/RESOURCES.md`
- `docs/TESTS.md`
- `exercises/shared/.docs/help.md`
- `exercises/shared/.docs/tests.md`

There might be more.

## Link check report

To help identify invalid links, we've automatically checked the links of _all_ `*.md` files in this repo.
This is the report of that check:

📝 Summary

---------------------

🔍 Total...........62

✅ Successful......62

⏳ Timeouts.........0

🔀 Redirected.......0

👻 Excluded.........0

🚫 Errors...........0

https://github.com/exercism/v3-launch/issues/54

Review the listed files, including docs/ABOUT.md, docs/INSTALLATION.md, docs/LEARNING.md, docs/RESOURCES.md, docs/TESTS.md, exercises/shared/.docs/help.md, and exercises/shared/.docs/tests.md. Compare their contents with the current project and inspect the link-check report; done means outdated documentation is identified and updated, with links remaining valid.

Written by the indexing model from the issue text.