Update csharp-sdk.md

[JayGhb]

Updated Azure AI Document Intelligence quickstart, C# SDK example for Prebuilt model, based on latest SDK version (1.0.0)

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[JayGhb]

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[prmerger-automator]

@JayGhb : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[v-dirichards]

@laujan

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

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[v-dirichards]

@laujan Could you review this proposed update to your article and enter #sign-off in a comment if it's ready to merge?

[github-actions]

This pull request has been inactive for at least 14 days. If you are finished with your changes, don't forget to sign off. See the contributor guide for instructions.
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[prmerger-automator]

@JayGhb : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.