Revise and expand on C/C++ language support section

I tried to define some undefined terms, and verified the commands and their output.

Author: catamorphism

component-model/examples/tutorial/c/adder/component.c

@@ -0,0 +1,6 @@
+#include "adder.h"
+
+uint32_t exports_docs_adder_add_add(uint32_t x, uint32_t y)
+{
+	return x + y;
+}

component-model/examples/tutorial/c/adder/component_with_printf.c

@@ -0,0 +1,9 @@
+#include "adder.h"
+#include <stdio.h>
+
+uint32_t exports_docs_adder_add_add(uint32_t x, uint32_t y)
+{
+	uint32_t result = x + y;
+	printf("%d", result);
+	return result;
+}