docs: remove broken link after API comments page deletion

Author: WenboCodes

docs/README.md

@@ -7,7 +7,7 @@
 1. [A3 版 TROWMAX 详细分析（面向小白到进阶）](./intrin-intro.md)
 2. [BinIntrinsic 设计与参数映射说明](./bin-intrinsic.md)
 3. [A2/A3 TBinOp 无循环 Intrinsic 化改造方案（含公开 Low-Level API）](./pto-intrinsic-plan.md)
-4. [PTO IR API 评审问题梳理](./pto-ir-api-comments.md)
+4. [PTO IR Reference](./pto-ir-manual.md)
 
 ## 说明