os/exec: doc typo

[cuiweixie]

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This PR (HEAD: d7d918d) has been imported to Gerrit for code review.

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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":"2026-04-13T17:44:27Z","revision":"5344ee931d00304aec22338715f22f9c0ab0beb9"}

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Message from Sean Liao:

Patch Set 1: -Commit-Queue

(Performed by <GERRIT_ACCOUNT_60063> on behalf of <GERRIT_ACCOUNT_34788>)

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Message from Go LUCI:

Patch Set 1:

This CL has failed the run. Reason:

Tryjob golang/try/gotip-linux-386 has failed with summary (view all results):

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• go on master (change 764364)

To reproduce, try gomote repro 8684615500297779457.

Additional links for debugging:

• go tool dist test -json output [shard 1]

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Message from Go LUCI:

Patch Set 1: LUCI-TryBot-Result-1

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Message from Sean Liao:

Patch Set 2: Code-Review+2 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":"2026-04-13T18:07:35Z","revision":"4b86f487c6de6a12d5ca9e39803ff2e875c19fba"}

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Message from Sean Liao:

Patch Set 2: -Commit-Queue

(Performed by <GERRIT_ACCOUNT_60063> on behalf of <GERRIT_ACCOUNT_34788>)

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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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Message from Keith Randall:

Patch Set 2: Code-Review+1

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Message from David Chase:

Patch Set 2: Code-Review+1

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This PR is being closed because golang.org/cl/764364 has been merged.