Update replacement for comments that should remain in the output.

Author: gkellogg

common/common.js

@@ -271,6 +271,6 @@ function unComment(doc, content) {
   return content
     .replace(/<!--/, '')
     .replace(/-->/, '')
-    .replace(/< !--/g, '<!--')
-    .replace(/-- >/g, '-->');
+    .replace(/< !\s*-\s*-/g, '<!--')
+    .replace(/-\s*- >/g, '-->');
 }

index.html

@@ -8451,7 +8451,6 @@ <h3>Graph Containers</h3>
     </script>
     -->
     </pre>
-    </pre>
     <table class="statements"
            data-result-for="Combining multiple JSON-LD script elements into a single dataset-original"
            data-to-rdf>
@@ -8537,15 +8536,15 @@ <h3>Graph Containers</h3>
            data-content-type="text/html">
       <!--
       <script type="application/ld+json">
-      < !--
+      < ! - -
       {
         "@context": "https://json-ld.org/contexts/person.jsonld",
         "@id": "http://dbpedia.org/resource/John_Lennon",
         "name": "John Lennon",
         "born": "1940-10-09",
         "spouse": "http://dbpedia.org/resource/Cynthia_Lennon"
       }
-      -- >
+      - - >
       </script>
       -->
       </pre>