Improve run-time API documentation

docs/godot_docs/cppexamples.md

@@ -179,6 +179,16 @@ CharacterBody2D player("%Player");
 const bool f = player.is_on_floor();
 ```
 
+The API is generated from the static function [Sandbox.generate_api](../godot_intro/sandbox.md#sandbox-api-reference):
+```py
+	var api = Sandbox.generate_api("cpp")
+	var fa = FileAccess.open("generated_api.hpp", FileAccess.WRITE)
+	fa.store_string(api)
+	fa.close()
+```
+
+The C++ API will look for `generated_api.hpp`, and if found, will automatically include it.
+
 :::note
 
 In practice you can write code just like GDScript. Even classes loaded at run-time should be accessible with auto-complete.

docs/godot_intro/sandbox.md

@@ -389,8 +389,11 @@ class Sandbox : public Node {
 	/// @return True if binary translation is loaded, false otherwise.
 	bool is_binary_translated() const;
 
-	/// @brief  Generate the C++ API to a String, based on current Godot version and loaded extensions.
-	/// @return The generated C++ API.
-	static String generate_api(String language = "cpp", String header_extra = "");
+	/// @brief Generate the run-time API for the guest program, by iterating through all loaded classes.
+	/// @param language The language to generate the API for.
+	/// @param header_extra Extra header code to add to the generated API.
+	/// @param use_argument_names If true, use argument names with default values in the generated API. Increases the size of the generated API and the compilation time.
+	/// @return The generated API code as a string.
+	static String generate_api(String language = "cpp", String header_extra = "", bool use_argument_names = false);
 };
 ```