Add docs

Author: rupprecht

lldb/include/lldb/Core/DemangledNameInfo.h

@@ -160,6 +160,16 @@ struct TrackingOutputBuffer : public llvm::itanium_demangle::OutputBuffer {
 };
 } // namespace lldb_private
 
+/// Custom deleter to use with unique_ptr.
+///
+/// Usage:
+/// \code{.cpp}
+///
+/// auto OB =
+///     std::unique_ptr<TrackingOutputBuffer, TrackingOutputBufferDeleter>(
+///         new TrackingOutputBuffer());
+///
+/// \endcode
 struct TrackingOutputBufferDeleter {
   void operator()(TrackingOutputBuffer *TOB) {
     if (!TOB)