Update values.schema.json

[guillaume-ferry]

Update invalid oauth2-proxy doc URL.

[vmwclabot]

@guillaume-ferry, you must sign our contributor license agreement before your changes are merged. Click here to sign the agreement. If you are a VMware employee, read this for further instruction.

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[vmwclabot]

@guillaume-ferry, we have received your signed contributor license agreement. The review is usually completed within a week, but may take longer under certain circumstances. Another comment will be added to the pull request to notify you when the merge can proceed.

[antgamdia]

Don't know why the @vmwclabot haven't replied back, but here I see The contributor license agreement has already been signed, so let's merge it.

Thanks for the contribution!

[vmwclabot]

@guillaume-ferry, VMware has approved your signed contributor license agreement.