Add description metadata for license policy approval

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Added description metadata for license policy approval page - https://gitlab.com/gitlab-org/gitlab/-/blob/master/doc/user/compliance/license_approval_policies.md

Related to: https://gitlab.com/gitlab-org/gitlab/-/issues/525312

This MR is related to the open issue: #525312 titled Add description metadata to docs for better link previews

The change has been performed and updated in spreadsheet