fix: 0->ø (trekhleb#486)

ly15927086342 · web-flow · commit 2444b9740b44 · 2020-08-09T14:13:36.000+02:00
diff --git a/src/data-structures/linked-list/README.zh-CN.md b/src/data-structures/linked-list/README.zh-CN.md
@@ -101,7 +101,7 @@ Traverse(head)
   Pre: head is the head node in the list
   Post: the items in the list have been traversed
   n ← head
-  while n != 0
+  while n != ø
     yield n.value
     n ← n.next
   end while
