docs: add warning to generated files

[lars-reimann]

Summary of Changes

Add a warning at the top of generated documentation files that they must not be edited directly.

[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ MARKDOWN	markdown-link-check	91		0	3.02s
✅ REPOSITORY	git_diff	yes		no	0.17s
✅ TYPESCRIPT	eslint	1	0	0	4.93s
✅ TYPESCRIPT	prettier	1	0	0	1.02s

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[codecov[bot]]

Codecov Report

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

Project coverage is 99.79%. Comparing base (6f90500) to head (b52692e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1208 +/- ## ======================================= Coverage 99.79% 99.79% ======================================= Files 110 110 Lines 19243 19247 +4 Branches 4109 4110 +1 ======================================= + Hits 19203 19207 +4 Misses 40 40 ```

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