Remove erroneous example from unit-no-unknown doc

[ybiquitous]

Which issue, if any, is this issue related to?

None, as it's a documentation fix.

Is there anything in the PR that needs further explanation?

No, it's self-explanatory.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7ec27d9

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[Mouvedia]

for the commit message

replace useless by erroneous

[ybiquitous]

@Mouvedia Thanks. I've changed the PR title and will change the commit message when squash and merge.

[mattxwang]

Thanks for catching this, LGTM!

(I'll let you merge)