Adding documentation and tests that maxBy/minBy return the first max/min element (Array, List, Seq)

[ursenzler]

Description

Added documentation and tests that maxBy/minBy return the first max/min element (Array, List, Seq).
Added tests that the first min/max element is returned (Array, List, Seq).
I wasn't able to add a test in CollectionModulesConsistency because I wasn't sure how to add it there because of the data generator.

!! I wasn't able to run the tests (fsx.exe not found in SDK 🤷) !!

I also cleaned up the exception docu on empty array/list/seq (once in the exceptions section, once as a remark).

I hope that helps 😃
Feel free to ignore, improve, change, take parts, ...

Fixes #19129

Checklist

• Test cases added
• Performance benchmarks added in case of performance changes
• Release notes entry updated: does not apply

[github-actions]

❗ Release notes required

@ursenzler,

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Change path	Release notes path	Description
src/FSharp.Core	docs/release-notes/.FSharp.Core/10.0.200.md	No release notes found or release notes format is not correct

[ursenzler]

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