Add doc for NU1704

[sbomer]

Adds documentation for the warning added in NuGet/NuGet.Client#7229.

[learn-build-service-prod]

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[learn-build-service-prod]

Learn Build status updates of commit df60919:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/reference/Errors-and-Warnings.md	✅Succeeded	View
docs/reference/errors-and-warnings/NU1704.md	✅Succeeded	View

For more details, please refer to the build report.

[Copilot]

Pull request overview

Adds documentation for the newly introduced NU1704 warning, and links it from the existing errors/warnings reference index so users can discover and understand the warning.

Changes:

• Add a new reference page documenting warning NU1704, including cause, conditions, and suppression guidance.
• Update the errors/warnings index table to include a link to NU1704.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
docs/reference/errors-and-warnings/NU1704.md	New documentation page describing NU1704, its trigger conditions, and mitigation/suppression guidance.
docs/reference/Errors-and-Warnings.md	Adds NU1704 to the “Package fallback warnings” row so it’s linked from the index.

[Copilot]

The quoted warning text reads awkwardly/incorrectly: "Package 'packageId' version uses..." (it looks like the version value is missing). Update the message to either include the version placeholder/value or rephrase to remove "version" so the sentence is grammatically correct and matches the actual NU1704 warning output.

Suggested change

	---
	# NuGet Warning NU1704
	> Package 'packageId' version uses the deprecated MonoAndroid framework instead of 'net6.0-android' or later. Consider upgrading to a newer version of this package or contacting the package author.
	ai-usage: ai-generated
	---
	# NuGet Warning NU1704
	> Package 'packageId' version 'version' uses the deprecated MonoAndroid framework instead of 'net6.0-android' or later. Consider upgrading to a newer version of this package or contacting the package author.

[Copilot]

docs/TOC.md contains individual entries for NU1701–NU1703 but not NU1704. Add an entry for NU1704 there as well so the new page shows up in the left-nav TOC (in addition to being linked from this index table).

[Frulfump]

This part from the implementation PR seems to not be covered

The detection inspects compile-time and runtime assembly paths in the lock file target library for 'monoandroid' folder segments, following the pattern of the previously removed MaccatalystFallback helper.

Does that mean it will only show up if you use lockfiles?

[nkolev92]

Due to historical reasons the type "LockFile" is the one that represents the assets file. So it'd be a massive breaking change to change that now, so often times people may refer to lock files, but they really mean the assets file.
The list of people that consistently use the distinct language is probably limited to the people that work on restore every day :D

[Frulfump]

Ah I see, thanks for the explanation!