docs: fix transformer config

[chansuke]

While reading the documentation of Transformer Configurations and found a few things to fix.

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[koba1t]

Could you change every example to unify space less indent style like docs?
ref: https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/resource/

[stormqueen1990]

+1 to this, agree with @koba1t that it would look better

[koba1t]

HI @chansuke
Thanks for your contribution!

I added a review comment. I hope you check my preference.