docs(terraform): add file patterns for Terraform Plan (aquasecurity#6393)

Author: nikpivkin

docs/docs/coverage/iac/index.md

@@ -8,14 +8,15 @@ Trivy scans Infrastructure as Code (IaC) files for
 
 ## Supported configurations
 
-| Config type                         | File patterns                 |
-|-------------------------------------|-------------------------------|
-| [Kubernetes](kubernetes.md)         | *.yml, *.yaml, *.json         |
-| [Docker](docker.md)                 | Dockerfile, Containerfile     |
-| [Terraform](terraform.md)           | *.tf, *.tf.json, *.tfvars,    |
-| [CloudFormation](cloudformation.md) | *.yml, *.yaml, *.json         |
-| [Azure ARM Template](azure-arm.md)  | *.json                        |
-| [Helm](helm.md)                     | *.yaml, *.tpl, *.tar.gz, etc. |
+| Config type                         | File patterns                                 |
+|-------------------------------------|-----------------------------------------------|
+| [Kubernetes](kubernetes.md)         | \*.yml, \*.yaml, \*.json                      |
+| [Docker](docker.md)                 | Dockerfile, Containerfile                     |
+| [Terraform](terraform.md)           | \*.tf, \*.tf.json, \*.tfvars                  |
+| [Terraform Plan](terraform.md)      | tfplan, \*.tfplan, \*.tfplan.json, \*.tf.json |
+| [CloudFormation](cloudformation.md) | \*.yml, \*.yaml, \*.json                      |
+| [Azure ARM Template](azure-arm.md)  | \*.json                                       |
+| [Helm](helm.md)                     | \*.yaml, \*.tpl, \*.tar.gz, etc.              |
 
 [misconf]: ../../scanner/misconfiguration/index.md
 [secret]: ../../scanner/secret.md