_content/doc/tutorial: apply the "keep going" principle to "add a test" examples

[just-an-engineer]

Fixes golang/go#68741

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[just-an-engineer]

Just redid the CLA. It was bugging out the first time, but it should be good now

[gopherbot]

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1:

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[gopherbot]

Message from Hyang-Ah Hana Kim:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from Hyang-Ah Hana Kim:

Patch Set 2: Code-Review+2

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[gopherbot]

Message from Robert Findley:

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

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Message from Go LUCI:

Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-08-12T14:32:32Z","revision":"b3647d5a9c4e3eaf008eb0c2c3a8f4364b461fdf"}

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[gopherbot]

Message from Robert Findley:

Patch Set 2: -Commit-Queue

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[gopherbot]

Message from Go LUCI:

Patch Set 2:

This CL has passed the run

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Message from Go LUCI:

Patch Set 2: LUCI-TryBot-Result+1

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