fix typo

Author: saschanaz

src/build/mdn-comments.ts

@@ -35,7 +35,7 @@ function extractSummary(markdown: string): string {
   // Normalize line breaks by collapsing consecutive newlines into a single space
   const normalizedText = firstParagraph
     // Extract first argument from multiple templates, handling escaped quotes & spaces
-    .replace(/\{\{ *(?:\w+)*([^}]*)\}\}/g, (_, arg) => {
+    .replace(/\{\{ *(?:\w+)?([^}]*)\}\}/g, (_, arg) => {
       arg = arg.trim();
       if (!arg) {
         return "";