Updated nlohmann::basic_json::is_boolean (markdown)

nlohmann::basic_json::is_boolean.md

@@ -37,24 +37,24 @@ int main()
     nlohmann::json j_array = {1, 2, 4, 8, 16};
     nlohmann::json j_string = "Hello, world";
 
-    std::cout << std::boolalpha << j_null.is_null() << '\n';
+    std::cout << std::boolalpha << j_null.is_boolean() << '\n';
     std::cout << std::boolalpha << j_boolean.is_boolean() << '\n';
-    std::cout << std::boolalpha << j_number.is_number() << '\n';
-    std::cout << std::boolalpha << j_object.is_object() << '\n';
-    std::cout << std::boolalpha << j_array.is_array() << '\n';
-    std::cout << std::boolalpha << j_string.is_string() << '\n';
+    std::cout << std::boolalpha << j_number.is_boolean() << '\n';
+    std::cout << std::boolalpha << j_object.is_boolean() << '\n';
+    std::cout << std::boolalpha << j_array.is_boolean() << '\n';
+    std::cout << std::boolalpha << j_string.is_boolean() << '\n';
 }
 ```
 
 ### Output
 
 ```
+false
 true
-true
-true
-true
-true
-true
+false
+false
+false
+false
 ```
 
 ## See also