Update Sandbox API reference

docs/godot_intro/cppprogram.md

@@ -41,7 +41,7 @@ Also, after each update you will need to `docker pull` the container in order to
 
 ## The C++ API
 
-The C++ API tries to mimick godot-cpp when it makes sense to do so. You can find [the C++ API implementation here](https://github.com/libriscv/godot-sandbox/tree/main/program/cpp/api), and [the C++ API reference here](cppapi.md).
+The C++ API tries to mimick godot-cpp when it makes sense to do so. You can find [the C++ API implementation here](https://github.com/libriscv/godot-sandbox/tree/main/program/cpp/api), and [the C++ API reference here](../godot_docs/cppapi.md).
 
 ## ELF Script
 

docs/godot_intro/sandbox.md

@@ -286,9 +286,11 @@ class Sandbox : public Node {
 	/// @brief Check if a program has been loaded into the sandbox.
 	/// @return True if a program has been loaded, false otherwise.
 	bool has_program_loaded() const;
+
 	/// @brief Set the program to run in the sandbox.
 	/// @param program The program to load and run.
 	void set_program(Ref<ELFScript> program);
+
 	/// @brief Get the program loaded into the sandbox.
 	/// @return The program loaded into the sandbox.
 	Ref<ELFScript> get_program();
@@ -303,6 +305,14 @@ class Sandbox : public Node {
 
 	// -= Self-testing, inspection and internal functions =-
 
+	/// @brief Get the current Callable set for redirecting stdout.
+	/// @return The current Callable set for redirecting stdout.
+	const Callable &get_redirect_stdout() const;
+
+	/// @brief Set a Callable to redirect stdout from the guest program to.
+	/// @param callback The callable to redirect stdout.
+	void set_redirect_stdout(const Callable &callback);
+
 	/// @brief Get the 32 integer registers of the RISC-V machine.
 	/// @return An array of 32 registers.
 	Array get_general_registers() const;