Added documentation on local-exec error codes

[sprutner]

This documents how a null_resource will not be created if the local-exec provisioner returns a non-zero error code, and how this can be used.

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[bflad]

Hi @sprutner 👋 Thank you for requesting this documentation change and apologies it was not reviewed in a timely fashion.

The provisioner functionality in Terraform is a concept that applies to any resource and not this resource in particular. Therefore, if this documentation were to be introduced, it seems more appropriate to include directly with the local-exec provisioner content so anyone can discover and benefit from this additional information. The current documentation can be found at https://www.terraform.io/language/resources/provisioners/local-exec which is sourced from https://github.com/hashicorp/terraform/blob/main/website/docs/language/resources/provisioners/local-exec.mdx if you would like to contribute this type of change there.

Thanks again.

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