[clang-tools-extra] [clangd] Improve Markup Rendering (PR #140498)

[Maksim Ivanov via cfe-commits]

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@@ -316,6 +399,12 @@ std::string indentLines(llvm::StringRef Input) {
 class Heading : public Paragraph {
 public:
   Heading(size_t Level) : Level(Level) {}
+
+  void renderEscapedMarkdown(llvm::raw_ostream &OS) const override {
+    OS << std::string(Level, '#') << ' ';
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emaxx-google wrote:

nit: Consider putting this line into a small helper.

https://github.com/llvm/llvm-project/pull/140498