add SMPTE DOI examples

Author: SteveLLamb

doc/main.html

@@ -540,6 +540,16 @@ <h4>Normative references section</h4>
       &lt;cite id=&quot;bib-HTML-5&quot;&gt;HTML Standard&lt;/cite&gt;, Living Standard. 
         &lt;a&gt;https://html.spec.whatwg.org/multipage/&lt;/a&gt;&lt;/li&gt;
     &lt;/li&gt;
+    &lt;li&gt;
+      &lt;cite id=&quot;bib-SMPTE-st429-18&quot;&gt;SMPTE ST 429-18&lt;/cite&gt;, D-Cinema Packaging — Immersive Audio Track 
+      File 
+        &lt;a&gt;https://doi.org/10.5594/SMPTE.ST429-18/&lt;/a&gt;&lt;/li&gt;
+    &lt;/li&gt;
+    &lt;li&gt;
+      &lt;cite id=&quot;bib-SMPTE-st429-18:2023&quot;&gt;SMPTE ST 429-18:2023&lt;/cite&gt;, D-Cinema Packaging — Immersive 
+      Audio Track File (2023 Edition)
+        &lt;a&gt;https://doi.org/10.5594/SMPTE.ST429-18.2023/&lt;/a&gt;&lt;/li&gt;
+    &lt;/li&gt;
   &lt;/ul&gt;
 &lt;/section&gt;</pre>
 </div>