Update doc

include/sta/fifo_buffer.hpp

@@ -14,11 +14,26 @@ namespace sta
 	class FifoBuffer
 	{
 	public:
+		/**
+		 * @brief FIFO size type.
+		 */
 		using size_type = Size;
+		/**
+		 * @brief Max number of bytes in FIFO.
+		 */
 		static constexpr size_type MAX_SIZE = N;
 
 	public:
+		/**
+		 * @brief Construct empty FIFO buffer.
+		 */
 		FifoBuffer();
+		/**
+		 * @brief Construct FIFO buffer with initial data.
+		 *
+		 * @param buffer    Source buffer
+		 * @param size      Buffer size
+		 */
 		FifoBuffer(const uint8_t * buffer, Size size);
 
 		/**