fix(.net): fix example for .NET

[Belphemur]

Summary

When using latest version of AWS.S3 SDK the DisableDefaultChecksumValidation = true also needs to be provided else the SDK still tries to sign the payload.

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Updated .NET example to include necessary parameters for AWS.S3 SDK compatibility with Cloudflare R2.

• Modified example to include DisableDefaultChecksumValidation = true along with DisablePayloadSigning = true for AWS.S3 SDK usage.
• Clarified requirements for using AWS.S3 SDK with Cloudflare R2 in the documentation.

Modified Files

• src/content/docs/r2/examples/aws/aws-sdk-net.mdx

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[Belphemur]

@jonesphillip @elithrar @Oxyjun
Also this is for the version 4.0 of the SDK

[harshil1712]

Hey @Belphemur, can you provide a repo to test this? Would us quickly add this change :D

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