Is there an existing issue for this?

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Describe the bug

There's an issue with the constructor documentation for RequestLocalizationMiddleware:

Looking at the source code, it seems that line 31 and 32 need to be swapped around.
https://github.com/dotnet/aspnetcore/blob/main/src/Middleware/Localization/src/RequestLocalizationMiddleware.cs

I also noticed there's a null check on lines 138 if (cultureName != null) and 186 if (name == null || supportedCultures == null), however StringSegment is a struct, so it can never be null.

Expected Behavior

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Steps To Reproduce

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Exceptions (if any)

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.NET Version

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Anything else?

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