fix: remove language identifier preambles from code snippets

Author: Andreas Gerlach

lib/datatip-manager.js

@@ -338,7 +338,7 @@ module.exports = class DatatipManager {
       snippets.forEach((snippet) => {
         const preElem = document.createElement('pre');
         const codeElem = document.createElement('code');
-        snippet = snippet.replace(/^\s*<!([a-zA-Z]+)?\s*/i, ''); // remove any preamble from the line
+        snippet = snippet.replace(/^\s*<(\?|!)([a-zA-Z]+)?\s*/i, ''); // remove any preamble from the line
         codeElem.classList.add(grammarName);
         codeElem.innerText = snippet.replace(regExpLSPPrefix, '');
         preElem.appendChild(codeElem);