Note regarding the new-api-needs-documentation label:

This serves as a reminder for when your PR is modifying a ref *.cs file and adding/modifying public APIs, please make sure the API implementation in the src *.cs file is documented with triple slash comments, so the PR reviewers can sign off that change.

Tagging subscribers to this area: @dotnet/area-system-buffers
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Added needs-breaking-change-doc-created label because this PR has the breaking-change label.

When you commit this breaking change:

1. Create and link to this PR and the issue a matching issue in the dotnet/docs repo using the breaking change documentation template, then remove this needs-breaking-change-doc-created label.
   • [Breaking change]: IndexOfAnyValues has been renamed to SearchValues docs#35244
2. Ask a committer to mail the .NET Breaking Change Notification DL.

Tagging @dotnet/compat for awareness of the breaking change.

This will break the next aspnetcore sync when merged, you will need MihaZupan/aspnetcore@e28a43b
cc: @Tratcher