Update Terraform integration documentation

[codedbychavez]

Describe the purpose of your pull request

• Update the sample usage section in the Terraform integration document at the following link: https://configcat.com/docs/integrations/terraform/#sample-usage

Things that have changed:

• Using version in the provider block is deprecated.
• The "order" attribute is now required in the configcat_setting resource.

Related issues (only if applicable)

• Update: Terraform Documentation

How to test? (only if applicable)

What part of the application was affected by the changes?

• Update the sample usage section in the Terraform documentation

What should be tested?

• Check if the changes are ok. I have tested the updated code sample and it works.

Requirement checklist

• I have validated my changes on a test/local environment.
• I have tested that the code snippets I added work. (Leave unchecked if there are no new code snippets.)
• I have added my changes to the V1 and V2 documentations.

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