docs: Fixes #16 - Documentation issue for testing deployment

[tobuck-aws]

Fixes the test for onboarding new tenants from the command line.

• No longer sends Tenant ID when creating a Tenant
• Now just tests creation by getting all tenants (vs. tenant with ID)

Issue #16

Closes #16

Reason for this change

Description of changes

No code changes, only docs.

Description of how you validated changes

Checklist

• [x] My code adheres to the CONTRIBUTING GUIDE

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