Update kubernetes.md
What does this MR do?
Fix the name of a parameter in the docs
Why was this MR needed?
Incorrect name
Are there points in the code the reviewer needs to double check?
Does this document need further updating in the light of helper images now being a thing? Is the "not supplying git" text still accurate?
Does this MR meet the acceptance criteria?
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Documentation created/updated - Tests
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All builds are passing
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Branch has no merge conflicts with master(if you do - rebase it please)