iter: add missing type parameter in doc

[ash2k]

No description provided.

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[gopherbot]

Message from Sean Liao:

Patch Set 1: Auto-Submit+1 Code-Review+2 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":"2025-06-28T09:53:02Z","revision":"f352e4543bd0c28ee356d3dc6d9e0fefe41b6964"}

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Message from Sean Liao:

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 Jorropo:

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

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Message from Keith Randall:

Patch Set 1: Code-Review+1

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[gopherbot]

This PR is being closed because golang.org/cl/684555 has been merged.