runtime: tweak wording for doc

[callthingsoff]

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Message from Jes Cok:

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":"2025-11-06T12:31:49Z","revision":"8a6ba3493eeb65e576e85545eac584e0d4630887"}

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Message from Jes Cok:

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 Keith Randall:

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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Message from Michael Pratt:

Patch Set 1: Code-Review+1

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This PR is being closed because golang.org/cl/718420 has been merged.