OneOrMore Example is wrong

### Type of issue

Other (describe below)

### Description

The OneOrMore example is didactically wrong.
It is not implementing “one or more elements” because the second case can easily hold zero to more elements. Therefore one should use a record type (product) for “one or more” not a union type (sum)

### Page URL

https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/union

### Content source URL

https://github.com/dotnet/docs/blob/main/docs/csharp/language-reference/builtin-types/union.md

### Document Version Independent Id

39218c8d-5d3f-ad57-b214-1b2862296ebf

### Platform Id

82841458-14a2-7ffb-b31d-a83c2619c5cc

### Article author

@BillWagner

### Metadata

* ID: 0cb4f7b9-7f0a-7e05-327c-e9c3ee03221a
* PlatformId: 82841458-14a2-7ffb-b31d-a83c2619c5cc
* Service: **dotnet-csharp**
* Sub-service: **lang-reference**

[Related Issues](https://github.com/dotnet/docs/issues?q=is%3Aissue+is%3Aopen+39218c8d-5d3f-ad57-b214-1b2862296ebf)

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[Associated WorkItem - 575820](https://dev.azure.com/msft-skilling/Content/_workitems/edit/575820)