Helm chart - document and add to schema nameOverride

[DrFaust92]

This fixes the helm chart validation and adds documentation for this param

[jetstack-bot]

Hi @DrFaust92. Thanks for your PR.

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[SgtCoDFish]

/lgtm
/approve

Thanks - I didn't even know we supported this but it makes sense to document properly and add it to the schema!

[jetstack-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: SgtCoDFish

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