Update ambassador.md

[omerfsen]

With this sample yaml we are getting:

  "status": {
    "code": -1,
    "info": "Empty json parameter in data",
    "reason": "MICROSERVICE_BAD_DATA",
    "status": 1
  }
}

error which is related with https://docs.seldon.io/projects/seldon-core/en/latest/reference/upgrading.html#wrapper-compatibility-table and also issue is fixed with new versions #1912 so better use 1.2.1 and 1.2.2 for this on this example.

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[seldondev]

Hi @omerfsen. Thanks for your PR.

I'm waiting for a SeldonIO member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[seldondev]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[axsaucedo]

/approve