Fix OpenApiSecuritySchemeReference usage

[IGx89]

Fixes the security requirement not actually being added to the OpenAPI spec in the last code example in the "Use document transformers" section of https://learn.microsoft.com/en-us/aspnet/core/fundamentals/openapi/customize-openapi?view=aspnetcore-10.0#use-document-transformers

Every operation before this change:

"security": [{ }]

After:

"security": [{ "Bearer": [] }]

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Internal previews

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aspnetcore/fundamentals/openapi/customize-openapi.md	Customize OpenAPI documents

[IGx89]

CC @xC0dex for review

[xC0dex]

You're so right! Thanks for the fix!

[guardrex]

Thanks @IGx89 ... Please also update the article date (ms.date in the metadata at the top) of ...

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/fundamentals/openapi/customize-openapi.md

... to make sure the build system pulls this change into the sample code shown.

[guardrex]

Thanks, @IGx89! ... Safia should be along shortly for a final signoff. In addition to the GH ping, I sent her an email, too. She's very busy these days! 🏃‍♀️

[guardrex]

No response ... let's go ahead. She might be OOF traveling or buried in work ⛏️. When she sees this, she'll let us know if she has a patch request.