fix: typo fix

src/advance/circle-self-ref/self-referential.md

@@ -373,7 +373,7 @@ fn main() {
 
 ## 学习一本书：如何实现链表
 
-最后，推荐一本专门将如何实现链表的书（真是富有 Rust 特色，链表都能复杂到出书了 o_o），[Learn Rust by writing Entirely Too Many Linked Lists](https://rust-unofficial.github.io/too-many-lists/)
+最后，推荐一本专门讲如何实现链表的书（真是富有 Rust 特色，链表都能复杂到出书了 o_o），[Learn Rust by writing Entirely Too Many Linked Lists](https://rust-unofficial.github.io/too-many-lists/)
 
 ## 总结