Fix incorrect EP options parameter names for TensorRT RTX

[FocusedSG]

Referenced from https://github.com/microsoft/onnxruntime/blob/main/include/onnxruntime/core/providers/nv_tensorrt_rtx/nv_provider_options.h

Description

Some of the parameter names for TensorRT RTX were incorrect.

Motivation and Context

To prevent misleading the reader.

[Copilot]

Pull Request Overview

This PR corrects parameter names in the TensorRT RTX Execution Provider documentation to match the actual implementation. The changes ensure that documentation accurately reflects the correct parameter names that users should use when configuring the provider.

• Updates three parameter names by adding the "nv_" prefix to match the actual implementation
• Corrects documentation to prevent user confusion when configuring TensorRT RTX options

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