Fix typo

draft-ietf-rats-reference-interaction-models.md

@@ -331,7 +331,7 @@ According to the RATS Architecture, two reference models for Challenge/Response
 
 1. Passport Model
 
-The passport modle is so named because of its resemblance to how nations issue passports to their citizens. In this Model, the attestation sequence is a
+The passport model is so named because of its resemblance to how nations issue passports to their citizens. In this Model, the attestation sequence is a
 two step procedure. In the first step, an Attester conveys Evidence to a Verifier which compares the Evidence against its appraisal policy.  The Verifier
 then gives back an Attestation Result to the Attester, which simply caches it. In the second step, the Attester presents the Attestation Result (and possibly additional Claims/evidence) to a Relying Party, which then compares this information against its own appraisal policy to establish the trustworthiness of the attestor.