Update vault_configuration.md

Set subcategory to "Configuration"

docs/resources/vault_configuration.md

@@ -1,7 +1,7 @@
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 # generated by https://github.com/hashicorp/terraform-plugin-docs
 page_title: "artifactory_vault_configuration Resource - terraform-provider-artifactory"
-subcategory: ""
+subcategory: "Configuration"
 description: |-
   This resource enables you to configure an external vault connector to use as a centralized secret management tool for the keys used to sign packages. For more information, see JFrog documentation https://jfrog.com/help/r/jfrog-platform-administration-documentation/vault.
   This feature is supported with Enterprise X and Enterprise+ licenses.