reflect: clarify documentation for Value.Seq/Seq2

[qiulaidongfeng]

For #66056

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Message from qiulaidongfeng:

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":"2024-05-09T12:31:20Z","revision":"ca663e44da26c46000139891806e6e1ce01811c9"}

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Message from qiulaidongfeng:

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 Cherry Mui:

Patch Set 1: Code-Review+2

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Message from Ian Lance Taylor:

Patch Set 1:

(1 comment)

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This PR is being closed because golang.org/cl/584515 has been merged.