Add snippet tags.

[BillWagner]

This fixes the current build warnings.

[opbld33]

Docs Build status updates of commit 44be7e8:

✅ Validation status: passed

File	Status	Preview URL	Details
snippets/fsharp/System/TupleT1,T2,T3,T4,T5,T6,T7,TRest/Item1/item1.fs	✅Succeeded	View

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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[tdykstra]

LGTM