Remove remnant

draft-bormann-core-corr-clar.md

@@ -244,9 +244,6 @@ that significant time elapses between a request and the arrival of a
 notification that is sent back as a response, causing a need for the
 latter to use a different box from the original request.
 
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 Also, additions to CoAP such as CoAP over connection-oriented
 transports {{-coap-tcp}} and OSCORE {{-oscore}} create similar matching
 boxes that also do not fit certain likely use cases of these additions