Update docs

Include updated usage on list functions.

src/packages/game/data/README.md

@@ -4,7 +4,7 @@ Fundamental functions for various data structures used in the project.
 
 ## `list`
 
-A singly-linked list is used on certain parts of the game, such as the memory pool's entries of currently allocated game
+A doubly-linked list is used on certain parts of the game, such as the memory pool's entries of currently allocated game
 objects.
 
 Here is how to properly use a list:
@@ -26,22 +26,22 @@ int main() {
 	
 	// lists should accept any type of value (void*), so the implementor is free to use whatever type they want
 	int node1_value = 1;
-	IZ_ListAppendNode(&list, &node1_value);
+	IZ_ListAppendNode(&list, &node1_value, NULL);
 	
 	int node2_value = 2;
-	IZ_ListAppendNode(&list, &node2_value);
+	IZ_ListAppendNode(&list, &node2_value, NULL);
 	
 	// pass predicate functions for finding nodes 
-	ListNode* find_node;
+	ListNode* find_node = NULL;
-	find_node = IZ_ListFindFirstNode(&list, &FindNodeWithValueTwo);
+	IZ_ListFindFirstNode(&list, &FindNodeWithValueTwo, &find_node);
 	if (find_node != NULL) {
 		printf("Found node with value 2!\n");
 	}
 	
 	ListNode* delete_node;
-	delete_node = IZ_ListFindFirstNode(&list, &FindNodeWithValueOne);
+	IZ_ListFindFirstNode(&list, &FindNodeWithValueOne, &delete_node);
 	// deletions are done only on one node at a time
-	IZ_ListDeleteNode(&list, delete_node);
+	IZ_ListDeleteNode(delete_node);
 	
 	// teardown takes care of de-allocating nodes and making sure data cannot be accessed sensibly anymore.
 	IZ_ListTeardown(&list);