fixing broken link in attestations article

Author: shanhix1

articles/governance/policy/concepts/attestation-structure.md

@@ -11,7 +11,7 @@ author: timwarner-msft
 Attestations are used by Azure Policy to set compliance states of resources or scopes targeted by [manual policies](effects.md#manual-preview). They also allow users to provide additional metadata or link to evidence which accompanies the attested compliance state.  
 
 > [!NOTE]
-> In preview, Attestations are available only through the [Azure Resource Manager (ARM) API](rest/api/policy/attestations).
+> In preview, Attestations are available only through the [Azure Resource Manager (ARM) API](/rest/api/policy/attestations).
 
 ## Best practices