Update spec for latest H273 values

draft-avtransport-spec.bs

@@ -2894,7 +2894,7 @@ These values are copied verbatim from [[H.273]].
 </div>
 
 Note: This list may not be up to date in this version of the AVTransport specifications.
-Users should consult [[H.273]] for up-to-date values and how to interpret them.
+Users should consult the latest [[H.273]] spec for up-to-date values and how to interpret them.
 
 
 ### Transfer Function Enumeration (enum <dfn enum>Transfer</dfn>) ### {#enum-Transfer}
@@ -2972,6 +2972,12 @@ These values are copied verbatim from [[H.273]]. The same note applies.
       :: SMPTE ST 2085 (2015)
     : <dfn noexport>MATRIX_ST2100</dfn> = <i>0xE</i>
       :: Rec. ITU-R BT.2100-2 ICTCP
+    : <dfn noexport>MATRIX_IPT_C2</dfn> = <i>0xF</i>
+      :: SMPTE ST 2128 (202x), equations 85 to 87
+    : <dfn noexport>MATRIX_YCGCO_RE</dfn> = <i>0x10</i>
+      :: [[H.273]], equations 58 to 65
+    : <dfn noexport>MATRIX_YCGCO_RO</dfn> = <i>0x11</i>
+      :: [[H.273]], equations 58 to 65
 </div>