update cloudflare_snippet and cloudflare_snippet_rules docs

[mihait-wwk]

Update docs for cloudflare_snippet and cloudflare_snippet_rules to include examples based on tests.
Include import syntax for cloudflare_snippet resource
Zone id taken from here https://registry.terraform.io/providers/cloudflare/cloudflare/4.48.0/docs/resources/ruleset

[github-actions]

changelog detected ✅

[jacobbednarz]

thanks for the PR! unfortunately, the file you've edited is a generated artifact of the documentation process. to see how to make changes to the documentation, you're best to check out https://github.com/cloudflare/terraform-provider-cloudflare/blob/master/contributing/registry-documentation.md

[github-actions]

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