fix: improve `prevent_unencrypted_uploads` documentation #30

Job	Run time
terraform-module / CI / Format HCL	13s
terraform-module / CI / Find modules	3s
terraform-module / Readme	0s
terraform-module / CI / Codeowners validate	4s
terraform-module / CI / Labels Validate	3s
terraform-module / CI / Lint (.)	16s
terraform-module / CI / Lint (./examples/complete)	17s
terraform-module / ci	1s
terraform-module / Release	0s
	57s

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