Fixed 3 broken links, 1 still needs fixing.

[Thrizian]

What is this pull request for?

This fixes broken links.

Except for one, in menus.yml.tt, I've added a todo for that because this readme does not exist? Should/Does it? It's not available at the moment and i needed it. Because i have no clue how to make menus just yet.

Notable changes (remove if none)

Fixed links in comments.

Checklist

• [ ] I have followed Pull Request guidelines
• [x] I have added a detailed description into each commit message
• [ ] I have added tests to cover this change

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.97%. Comparing base (efb901e) to head (3c1f4b2).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2924 +/- ## ======================================= Coverage 95.97% 95.97% ======================================= Files 232 232 Lines 6279 6279 ======================================= Hits 6026 6026 Misses 253 253 ```

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