runtime/trace: fix documentation comment

[jjpinto]

Correct documentation comment for mul function

[gopherbot]

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[gopherbot]

Message from Michael Knyszek:

Patch Set 1: Code-Review+2

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Message from Michael Knyszek:

Patch Set 1: Commit-Queue+1

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Message from Go LUCI:

Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2026-01-06T17:11:27Z","revision":"f1b3e8b80a44ef20392fa5cd71bd09fd131c3b8c"}

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Message from Michael Knyszek:

Patch Set 1: -Commit-Queue

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Message from Go LUCI:

Patch Set 1:

This CL has passed the run

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Message from Go LUCI:

Patch Set 1: LUCI-TryBot-Result+1

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Message from Michael Pratt:

Patch Set 1: Code-Review+2

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This PR is being closed because golang.org/cl/734100 has been merged.