fix: update authorization chain diagram — Trust Gateway replaces Payment Authorization

Author: naory

index.html

@@ -299,7 +299,7 @@ <h1>Machine Payment Control Protocol (MPCP)</h1>
       <line x1="675" y1="200" x2="675" y2="240" class="arrow"/>
 
       <rect x="560" y="240" width="230" height="45" class="box"/>
-      <text x="675" y="268" class="label">Payment Authorization</text>
+      <text x="675" y="268" class="label">Trust Gateway</text>
 
       <line x1="675" y1="285" x2="675" y2="325" class="arrow"/>