LibTLS: Add references to RFC5246 for the verify procedure

Author: https://github.com/msvisser
Commit: 331092d25a
Pull-request: https://github.com/SerenityOS/serenity/pull/12739
Reviewed-by: https://github.com/alimpfard

Userland/Libraries/LibTLS/HandshakeServer.cpp

@@ -359,6 +359,7 @@ ssize_t TLSv12::verify_rsa_server_key_exchange(ReadonlyBytes server_key_info_buf
         dbgln("verify_rsa_server_key_exchange failed: Attempting to verify signature without certificates");
         return (i8)Error::NotSafe;
     }
+    // RFC5246 section 7.4.2: The sender's certificate MUST come first in the list.
     auto certificate_public_key = m_context.certificates.first().public_key;
     Crypto::PK::RSAPrivateKey dummy_private_key;
     auto rsa = Crypto::PK::RSA(certificate_public_key, dummy_private_key);