fix whitespace

Author: marten-seemann

draft-ietf-quic-transport.md

@@ -938,9 +938,9 @@ the connection ID via a RETIRE_CONNECTION_ID frame
 ({{frame-retire-connection-id}}).
 
 An endpoint SHOULD ensure that its peer has a sufficient number of available and
-unused connection IDs. Endpoints store received connection IDs for future use. 
-They advertise the limit how many unretired connection IDs they are willing to 
-store in the transport parameters. An endpoint MUST NOT provide more connection 
+unused connection IDs. Endpoints store received connection IDs for future use.
+They advertise the limit how many unretired connection IDs they are willing to
+store in the transport parameters. An endpoint MUST NOT provide more connection
 IDs than this limit. An endpoint MUST treat receipt of more than this number of
 connection IDs as an error of type CONNECTION_ID_LIMIT_ERROR. If an endpoint has
 provided its peer with the maximum number of connection IDs, the earliest time