Fix the local verification using certificates docs.

Verification using certificates requires also the
validation of the certificate's issuer and identity.

content/en/verifying/verify.md

@@ -76,7 +76,7 @@ $ cosign verify --key cosign.pub --local-image PATH/to/user/demo
 Verify image with local certificate and local certificate chain:
 
 ```shell
-$ cosign verify --certificate cosign.crt --certificate-chain chain.crt user/demo
+$ cosign verify --certificate cosign.crt --certificate-chain chain.crt --certificate-oidc-issuer https://issuer.example.com --certificate-identity foo@example.com user/demo
 ```
 
 ## Verify image with user-provided trusted chain