Fix content after fenced code block being treated as code

Fixes #52509

extensions/markdown-language-features/src/markdownEngine.ts

@@ -47,7 +47,7 @@ export class MarkdownEngine {
 							return `<div>${hljs.highlight(lang, str, true).value}</div>`;
 						} catch (error) { }
 					}
-					return `<code><div>${this.md!.utils.escapeHtml(str)}</div>`;
+					return `<code><div>${this.md!.utils.escapeHtml(str)}</div></code>`;
 				}
 			}).use(mdnh, {
 				slugify: (header: string) => this.slugifier.fromHeading(header).value