docs(security_policy): remove deprecated ee/ prefix from documentation links

sai krishna chowdaryrequested to merge
kittusontineni/terraform-provider-gitlab:docs-security-policy-clean-url into main

What does this MR do?

Removes the deprecated \ee/\ prefix from GitLab Security Policies documentation links in \docs/data-sources/security_policy_document.md\ and \internal/provider/datasource_gitlab_security_policy_document.go.

The canonical URL is \https://docs.gitlab.com/user/application_security/policies/scan_execution_policies/\.

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