Ensure terraform import documented for all supported resources

[DanInProgress]

Most of the terraform providers support terraform import but mutliple are lacking documentation,
creating an issue to inventory all resrouces and ensure that they have proper documentation.

This is especially important given the frequency of failures due to parallelism issues.
terraform import is a vital tool for users when trying to fix bad terraform state.

• sigsci_corp_cloudwaf_certificate docs md
• sigsci_corp_cloudwaf_instance docs md
• sigsci_corp_integration docs md
• sigsci_corp_list docs md
• sigsci_corp_rule docs md
• sigsci_corp_signal_tag docs md
• sigsci_edge_deployment docs md
• sigsci_edge_deployment_service docs md
• sigsci_edge_deployment_service_backend docs md
• sigsci_site docs md
• sigsci_site_alert docs md
• sigsci_site_allowlist docs md
• sigsci_site_blocklist docs md
• sigsci_site_header_link docs md
• sigsci_site_integration docs md
• sigsci_site_list docs md
• sigsci_site_redaction docs md
• sigsci_site_rule docs md
• sigsci_site_signal_tag docs md
• sigsci_site_templated_rule docs md

I'll review some of the links above and update with what I find. I've already seen a couple of related issues #159 and #202

[DanInProgress]

🤔 reading #159 and noting that sigsci_site_templated_rule does actually have a section titled import:

terraform-provider-sigsci/docs/resources/site_templated_rule.md

Lines 125 to 131 in 2feaf97

	## Import
	Import is supported using the following syntax:
	```terraform
	terraform import sigsci_site_templated_rule.test site_short_name:id
	```

I don't know if I can properly evaluate this list, given that I've not tried to import these. The ids of a lot of these seem somewhat obfuscated on the admin dashboard.

[BrooksCunningham]

Thanks for the comment @DanInProgress . I've been doing some tinkering and this format works for some of the templated rules.

import {
  id = "site_short_name:LOGINATTEMPT"
  to = sigsci_site_templated_rule.site_short_nameLOGINATTEMPT
}

Some of the templated rules are managed the sigsci_site_templated_rule resource and others are not.

I did make a tool to automagically generate HCL for an NGWAF config. You are welcome to give it a try and see if it at least can build out the HCL as you would expect it to. https://github.com/BrooksCunningham/ngwaf-terraformify

As a disclaimer, this tool is not an official Fastly supported tool.

[danicat]

The following resources have import documentation, but the markdown is labelled incorrectly as terraform instead of shell which I believe is creating problems:

• sigsci_corp_integration
• sigsci_site_header_link
• sigsci_site_integration
• sigsci_site_redaction
• sigsci_site_rule
• sigsci_site_templated_rule

See:

terraform-provider-sigsci/docs/resources/site_templated_rule.md

Lines 129 to 131 in 0b85b22

	```terraform
	terraform import sigsci_site_templated_rule.test site_short_name:id
	```

Should be like this instead (notice the shell tag instead of terraform):

terraform-provider-sigsci/docs/resources/site_list.md

Lines 51 to 53 in 0b85b22

	```shell
	terraform import sigsci_site_list.test site_short_name:id
	```