fix

Author: Mr-Leshiy

rust/signed_doc/README.md

@@ -38,6 +38,9 @@ which **must** be present (most of the fields originally defined by this
 Precise CDDL definition
 
 ```cddl
+; All encoders/decoders of this specification must follow deterministic cbor encoding rules
+; https://datatracker.ietf.org/doc/html/draft-ietf-cbor-cde-06
+
 protected_header = {
    1 => -8, ; "alg": EdDSA
    3 => 30, ; "content type": Json
@@ -77,6 +80,9 @@ each Catalyst signed document [COSE] signature **must** include the following pr
 Precise CDDL definition
 
 ```cddl
+; All encoders/decoders of this specification must follow deterministic cbor encoding rules
+; https://datatracker.ietf.org/doc/html/draft-ietf-cbor-cde-06
+
 signature_protected_header = {
     4 => bytes ; "kid"
 }