[doc] Updated document on max map count (#1037)

### What problem does this PR solve?

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### Type of change

- [x] Documentation Update

README_zh.md

@@ -94,7 +94,7 @@
 
 ### 🚀 启动服务器
 
-1. 确保 `vm.max_map_count` 不小于 262144 【[更多](./docs/guides/max_map_count.md)】：
+1. 确保 `vm.max_map_count` 不小于 262144：
 
    > 如需确认 `vm.max_map_count` 的大小：
    >