fix: add missing argument for highlighting code

Author: smalluban

src/core/render/compiler/code.js

@@ -3,11 +3,12 @@ import Prism from 'prismjs';
 import 'prismjs/components/prism-markup-templating';
 
 export const highlightCodeCompiler = ({ renderer }) =>
-  (renderer.code = function(code, lang = '') {
+  (renderer.code = function(code, lang = 'markup') {
     const langOrMarkup = Prism.languages[lang] || Prism.languages.markup;
     const text = Prism.highlight(
       code.replace(/@DOCSIFY_QM@/g, '`'),
-      langOrMarkup
+      langOrMarkup,
+      lang
     );
 
     return `<pre v-pre data-lang="${lang}"><code class="lang-${lang}">${text}</code></pre>`;