[fix] user-docs: #134 remove unwrap and deny its use

lib/dubp/user-docs/src/documents/certification.rs

lib/dubp/user-docs/src/documents/certification/v10.rs

lib/dubp/user-docs/src/documents/identity.rs

lib/dubp/user-docs/src/documents/identity/v10.rs

lib/dubp/user-docs/src/documents/membership.rs

lib/dubp/user-docs/src/documents/membership/v10.rs

lib/dubp/user-docs/src/documents/mod.rs

lib/dubp/user-docs/src/documents/revocation.rs

lib/dubp/user-docs/src/documents/revocation/v10.rs

lib/dubp/user-docs/src/documents/transaction.rs

lib/dubp/user-docs/src/lib.rs