Update protos/sigstore_common.proto

Co-authored-by: Fredrik Skogman <[email protected]>
Signed-off-by: William Woodruff <[email protected]>

protos/sigstore_common.proto

@@ -176,7 +176,7 @@ message SubjectAlternativeName {
 message X509CertificateChain {
         // One or more DER-encoded certificates.
         //
-        // In some contexts (such as `VerificationMaterial.certificate`), this sequence
+        // In some contexts (such as `VerificationMaterial.x509_certificate_chain`), this sequence
         // has an imposed order. Unless explicitly specified, there is otherwise no
         // guaranteed order.
         repeated X509Certificate certificates = 1;