fmt: amend comment for getField

[callthingsoff]

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Message from Rob Pike:

Patch Set 1: Code-Review+2

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Message from Sense As:

Patch Set 1:

(1 comment)

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Message from Ian Lance Taylor:

Patch Set 1: Auto-Submit+1 Code-Review+1 Run-TryBot+1

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Gopher Robot:

Patch Set 1: TryBot-Result+1

(1 comment)

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Message from Sense As:

Patch Set 1:

(1 comment)

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This PR is being closed because golang.org/cl/519935 has been merged.