x/tools/go/analysis: document AllObjectFacts return value

[willboland]

Fixes golang/go#70351

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[gopherbot]

Message from Alan Donovan:

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

(1 comment)

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Message from Go LUCI:

Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-12-30T01:03:52Z","revision":"85d01eb8436893ce704ce66681944656797ed862"}

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Message from Alan Donovan:

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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This PR is being closed because golang.org/cl/638278 has been merged.