Dataset subset assignments in doc

[matzegoebel]

Added explanation of new feature (PR #5045) that allows assigning values to a subset of a dataset to the documentation.

[max-sixty]

Looks good! Thanks @matzegoebel

[keewis]

I've got a few more changes which I think might be worth changing before merging. Looks good otherwise, though.

[keewis]

I've got a few more comments, but other than that we can probably merge (unless someone else has more comments?)

[keewis]

great, thanks for the updates. I'll merge this in a day or two if there are no further comments.

[max-sixty]

Thanks @matzegoebel ! If you'd like to add a whatsnew, please feel free to in another PR

[github-actions]

Unit Test Results

0 files  ±0  0 suites  ±0   0s ⏱️ ±0s
0 tests ±0  0 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit bdba981. ± Comparison against base commit bdba981.

[keewis]

Thanks @matzegoebel ! If you'd like to add a whatsnew, please feel free to in another PR

there's already one for the new feature so the most that should be done is adding this PR to that entry (definitely optional, though).

Thanks again, @matzegoebel.