Update architecture/verifier/freshness.md

Co-authored-by: Yogesh Deshpande <[email protected]>

architecture/verifier/freshness.md

@@ -75,7 +75,7 @@ this is the preferred way of  implementing freshness checks in Veraison.
 
 ### Checking via OPA policy
 
-OPA is currently the only policy agent implementation in Veraison. Polices are
+OPA is currently the only policy agent implementation in Veraison. Policies are
 written using [Rego policy
 language](https://www.openpolicyagent.org/docs/latest/policy-language/). When
 the policy runs, the `policy` package is pre-populated with the appropriate