MINOR: [Docs][Archery] Correct the links in the README.md
MINOR: [Docs][Archery] Correct the links in the README.md

This PR corrects the links in the `archery/README.md` due to the change in the structure of the developers docs.

Closes #12400 from AlenkaF/minor-archery-links

Authored-by: Alenka Frim <f50e75d4c31e511ffacbf2da8f53d7ed4bd8eabe@gmail.com>
Signed-off-by: David Li <dc24f9cfc84fb1675ce65c8444a2c3e2f0e5f297@gmail.com>

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