Documentation: Default value for ApiVersionReader is misleading

[YC]

Is there an existing issue for this?

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Describe the bug

According to the documentation comment:

The default value is the QueryStringApiVersionReader, which only reads the API version from the "api-version" query string parameter.

Instead, the default is Combine( new QueryStringApiVersionReader(), new UrlSegmentApiVersionReader() ).

https://github.com/dotnet/aspnet-api-versioning/blob/v8.1.0/src/Common/src/Common/ApiVersioningOptions.cs#L65-L69
https://github.com/dotnet/aspnet-api-versioning/blob/v8.1.0/src/Common/src/Common/ApiVersionReader.cs#L25

Expected Behavior

The documentation should be updated to reflect that the default is a combination of both.

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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