fix typo in the multi-region documentation

[guillaumebernard84]

Simple typo fix on the multi-region documentation. I was getting "Error: unknown flag: --additionnal-topology" errors because I copy/pasted the examples in the documentation. Indeed, the correct option is "--additional-topology", with a single N

Release note:

NONE

[linux-foundation-easycla[bot]]

• :white_check_mark:login: guillaumebernard84 / (9534bd14015feddcef7d74a82c0dba92b4a5e74e)

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[k8s-ci-robot]

Hi @guillaumebernard84. Thanks for your PR.

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[jichenjc]

/ok-to-test

[jichenjc]

/approve /lgtm

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This pull-request has been approved by: jichenjc

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