add docs for new NuGet warning NU3043

[kartheekp-ms]

Tracking: https://github.com/NuGet/Client.Engineering/issues/2994

Starting with .NET 9 Preview 7 and NuGet.exe 6.12, NuGet sign commands will raise a NU3043 warning if an invalid value or SHA-1 hash is passed for the certificate fingerprint option. The value must be a SHA-256, SHA-384, or SHA-512 certificate fingerprint (in hexadecimal).

[learn-build-service-prod]

Learn Build status updates of commit 44f00ee:

💡 Validation status: suggestions

File	Status	Preview URL	Details
docs/reference/Errors-and-Warnings.md	💡Suggestion	View	Details
docs/reference/errors-and-warnings/NU3043.md	✅Succeeded	View

docs/reference/Errors-and-Warnings.md

• Line 28, Column 2: [Suggestion: column-header-missing - See documentation] Column headers are required for tables. Add appropriate header text, or remove any extra table cells that cause an extra column.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

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[learn-build-service-prod]

Learn Build status updates of commit 7dc5a33:

💡 Validation status: suggestions

File	Status	Preview URL	Details
docs/reference/Errors-and-Warnings.md	💡Suggestion	View	Details
docs/reference/errors-and-warnings/NU3043.md	✅Succeeded	View

docs/reference/Errors-and-Warnings.md

• Line 28, Column 2: [Suggestion: column-header-missing - See documentation] Column headers are required for tables. Add appropriate header text, or remove any extra table cells that cause an extra column.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[zivkan]

I disabled auto merge, because I want multiple people to have the opportunity to review and provide comments before it gets merged, not just the first person to review it 1 minute after the PR was created.

[zivkan]

This is not using the same formatting/style that most other warning pages use.

[kartheekp-ms]

I updated the docs in the latest commit. Please take a look and let me know if it looks good.

[zivkan]

All other warning pages has an ## Issue header, that explains why the warning exists, before the solution section

[kartheekp-ms]

Great catch. Fixed in the latest commit.

[learn-build-service-prod]

Learn Build status updates of commit 1a1b283:

💡 Validation status: suggestions

File	Status	Preview URL	Details
docs/reference/Errors-and-Warnings.md	💡Suggestion	View	Details
docs/reference/errors-and-warnings/NU3043.md	✅Succeeded	View

docs/reference/Errors-and-Warnings.md

• Line 28, Column 2: [Suggestion: column-header-missing - See documentation] Column headers are required for tables. Add appropriate header text, or remove any extra table cells that cause an extra column.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit bfe5eaa:

💡 Validation status: suggestions

File	Status	Preview URL	Details
docs/reference/Errors-and-Warnings.md	💡Suggestion	View	Details
docs/reference/errors-and-warnings/NU3043.md	✅Succeeded	View

docs/reference/Errors-and-Warnings.md

• Line 28, Column 2: [Suggestion: column-header-missing - See documentation] Column headers are required for tables. Add appropriate header text, or remove any extra table cells that cause an extra column.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit af2d843:

💡 Validation status: suggestions

File	Status	Preview URL	Details
docs/reference/Errors-and-Warnings.md	💡Suggestion	View	Details
docs/reference/errors-and-warnings/NU3043.md	✅Succeeded	View

docs/reference/Errors-and-Warnings.md

• Line 28, Column 2: [Suggestion: column-header-missing - See documentation] Column headers are required for tables. Add appropriate header text, or remove any extra table cells that cause an extra column.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit 04daf90:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/reference/Errors-and-Warnings.md	✅Succeeded	View
docs/reference/errors-and-warnings/NU3043.md	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit a044c0d:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/reference/Errors-and-Warnings.md	✅Succeeded	View
docs/reference/errors-and-warnings/NU3043.md	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel