package.json: clarify format and precedence of env-setting debug attributes

[polinasok]

Updates #2206

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Message from Hyang-Ah Hana Kim:

Patch Set 2: Run-TryBot+1

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Message from Hyang-Ah Hana Kim:

Patch Set 2:

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Patch Set 2:

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Patch Set 2: TryBot-Result-1

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This PR (HEAD: 4a6466c) has been imported to Gerrit for code review.

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Message from Polina Sokolova:

Patch Set 2:

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Message from Hyang-Ah Hana Kim:

Patch Set 4: Run-TryBot+1 Code-Review+2

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Patch Set 4:

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Patch Set 4: TryBot-Result+1

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This PR is being closed because golang.org/cl/401974 has been merged.