Remove documentation for deprecated NUGET_EXPERIMENTAL_USE_NJ_FOR_FILE_PARSING environment variable

[Copilot]

Fixes NuGet/Home#14258

This PR removes the documentation for the NUGET_EXPERIMENTAL_USE_NJ_FOR_FILE_PARSING environment variable, which was removed from the NuGet codebase in #14257.

Background

The NUGET_EXPERIMENTAL_USE_NJ_FOR_FILE_PARSING environment variable was introduced in NuGet 6.10 as a fallback mechanism when the assets file parser was migrated from Newtonsoft.Json to System.Text.Json. It allowed users to revert to the old Newtonsoft.Json parser if they encountered issues with the new System.Text.Json implementation.

However, no issues were reported with the System.Text.Json parser, indicating it was working reliably. As a result, the environment variable and the associated Newtonsoft.Json fallback code were removed from the NuGet codebase to reduce technical debt.

Changes

• Removed the table row documenting NUGET_EXPERIMENTAL_USE_NJ_FOR_FILE_PARSING from the CLI environment variables reference page
• No other references to this environment variable exist in the documentation

This ensures the documentation accurately reflects the current state of NuGet, where this experimental environment variable is no longer available.

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[learn-build-service-prod]

Learn Build status updates of commit 63a31e4:

✅ Validation status: passed

For more details, please refer to the build report.

[learn-build-service-prod]

Learn Build status updates of commit 9b91d53:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/reference/cli-reference/cli-ref-environment-variables.md	✅Succeeded	View

For more details, please refer to the build report.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

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Information: PoliCheck | Severity Guidance | Term
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[learn-build-service-prod]

Learn Build status updates of commit 9b91d53:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/reference/cli-reference/cli-ref-environment-variables.md	✅Succeeded	View

For more details, please refer to the build report.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[Copilot]

Pull Request Overview

This PR removes documentation for the deprecated NUGET_EXPERIMENTAL_USE_NJ_FOR_FILE_PARSING environment variable that was previously removed from the NuGet codebase. The environment variable was an experimental fallback mechanism for using Newtonsoft.Json instead of System.Text.Json for parsing assets files, but it was removed due to the reliability of the new parser.

• Removes the table row documenting the deprecated environment variable
• Ensures documentation accuracy by reflecting the current state of NuGet

Comments suppressed due to low confidence (1)

docs/reference/cli-reference/cli-ref-environment-variables.md:1

• There's a spelling error in the removed line: 'Netwonsoft.Json' should be 'Newtonsoft.Json'. While this line is being removed, it's worth noting the typo existed in the original documentation.

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