docs: fix certificate verification example in README

- Add skip comment to prevent CI failures
- Use generic cert filename

Author: FlavPMU

README.md

@@ -194,12 +194,13 @@ mdoc.disclosure_map
 For production use, verify both the X.509 certificate chain and element hashes:
 
 ````python
+# skip in doc examples (requires your_ca_cert.pem and device_response_bytes)
 from pymdoccbor.mdoc.verifier import MdocCbor
 from cryptography import x509
 from cryptography.hazmat.backends import default_backend
 
 # Load trusted root certificates
-with open('iaca_cert.pem', 'rb') as f:
+with open('your_ca_cert.pem', 'rb') as f:
     iaca_cert = x509.load_pem_x509_certificate(f.read(), default_backend())
 
 mdoc = MdocCbor()
@@ -211,10 +212,6 @@ For complete documentation on certificate chain verification and hash verificati
 
 ### Verify the Mobile Security Object
 
-````
-
-### Verify the Mobile Security Object
-
 ````
 from pymdoccbor.mso.verifier import MsoVerifier