fix duplicate title in guessing-game-tutorial

ch02-00-guessing-game-tutorial.md has two `接收用户输入` title
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117503445 3 years ago committed by GitHub
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commit 01776dd7a3
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@ -115,8 +115,6 @@ let mut bananas = 5; // 可变
### 接收用户输入
### 接收用户输入
回忆一下,我们在程序的第一行使用 `use std::io;` 从标准库中引入了输入/输出功能。现在调用 `io` 库中的函数 `stdin`
```rust,ignore

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