go/parser: add missing parenthesis in a comment

[ishwar00]

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Patch Set 1:

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[gopherbot]

Message from Robert Griesemer:

Patch Set 1: Run-TryBot+1 Auto-Submit+1 Code-Review+2

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[gopherbot]

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 Bryan Mills:

Patch Set 1: Code-Review+1

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[gopherbot]

This PR is being closed because golang.org/cl/447217 has been merged.