[DOC] Fix alignment_result doc

[eseiler]

Resolves #3202

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Name	Status	Preview	Comments	Updated (UTC)
seqan3	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 2, 2023 1:24pm

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Codecov Report

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

Comparison is base (999c0bf) 98.14% compared to head (cb7aa56) 98.15%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3204 +/- ## ======================================= Coverage 98.14% 98.15% ======================================= Files 269 269 Lines 11855 11855 ======================================= + Hits 11635 11636 +1 + Misses 220 219 -1 ``` | [Files](https://app.codecov.io/gh/seqan/seqan3/pull/3204?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan) | Coverage Δ | | |---|---|---| | [...ude/seqan3/alignment/pairwise/alignment\_result.hpp](https://app.codecov.io/gh/seqan/seqan3/pull/3204?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan#diff-aW5jbHVkZS9zZXFhbjMvYWxpZ25tZW50L3BhaXJ3aXNlL2FsaWdubWVudF9yZXN1bHQuaHBw) | `100.00% <ø> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/seqan/seqan3/pull/3204/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan)

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