Apply suggestions from code review

Thanks for the suggestion, I like it.

Co-Authored-By: Martin Thomson <mt@lowentropy.net>

draft-ietf-quic-http.md

@@ -1340,8 +1340,8 @@ Different values for the same parameter can be advertised by each peer. For
 example, a client might be willing to consume a very large response header,
 while servers are more cautious about request size.
 
-Setting identifiers MUST NOT occur more than once in the SETTINGS frame.  A
-receiver MAY treat the presence of the same setting identifier more than once as
+The same setting identifier MUST NOT occur more than once in the SETTINGS frame.  A
+receiver MAY treat the presence of duplicate setting identifiers as
 a connection error of type HTTP_SETTINGS_ERROR.
 
 The payload of a SETTINGS frame consists of zero or more parameters.  Each