Add terraform docs generation #22

Job	Run time
terraform-fmt	3s
terraform-validate (asset-account/terraform/stack-set/examples/self-managed)	12s
prettier	5s
terraform-validate (asset-account/terraform/stack-set/examples/service-managed)	12s
terraform-docs (asset-account/terraform/stack-set)	11s
typos	6s
	49s

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