Update text

draft-ietf-tls-tls13.md

@@ -1282,9 +1282,10 @@ out-of-band provisioned pre-shared secret, a critical consideration is
 using sufficient entropy during the key generation, as discussed in
 [RFC4086]. Deriving a shared secret from a password or other
 low-entropy sources is not secure. A low-entropy secret, or password,
-is subject to dictionary attacks. The specified PSK authentication is
-not a strong password-based authenticated key exchange even when used
-with Diffie-Hellman key establishment.
+is subject to dictionary attacks based on the PSK binder.  The
+specified PSK authentication is not a strong password-based
+authenticated key exchange even when used with Diffie-Hellman key
+establishment.
 
 ## Zero-RTT Data
 
@@ -1585,16 +1586,6 @@ For example:
        } VariantRecord;
 
 
-## Decoding Errors
-
-TLS defines two generic alerts (see {{alert-protocol}}) to use upon failure to parse
-a message. Peers which receive a message which cannot be parsed according to the syntax
-(e.g., have a length extending beyond the message boundary or contain an out-of-range
-length) MUST terminate the connection with a "decode_error" alert. Peers which receive
-a message which is syntactically correct but semantically invalid (e.g., a DHE share of p - 1,
-or an invalid enum) MUST terminate the connection with an "illegal_parameter" alert.
-
-
 # Handshake Protocol
 
 The handshake protocol is used to negotiate the secure attributes