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MINOR: [Docs] Correct a small typo in archery docs (#41412)

### Rationale for this change

The name is archery not archer 

### What changes are included in this PR?

`s/archer /archery/` 

### Are these changes tested?

No, docs only

### Are there any user-facing changes?

Yes, to the docs

Authored-by: Jonathan Keane <jkeane@gmail.com>
Signed-off-by: AlenkaF <frim.alenka@gmail.com>