Merge pull request #951 from HapiHaha/fix/ch12-03-listing-12-13-display

fix(ch12): use full rustdoc_include for listing 12-13 to avoid hidden…

src/ch12-03-improving-error-handling-and-modularity.md

@@ -237,7 +237,7 @@ Rust 提示我们的代码忽略了 `Result` 值，它可能表明这里存在
 <span class="filename">文件名：src/lib.rs</span>
 
 ```rust,ignore,does_not_compile
-{{#rustdoc_include ../listings/ch12-an-io-project/listing-12-13/src/lib.rs:here}}
+{{#rustdoc_include ../listings/ch12-an-io-project/listing-12-13/src/lib.rs}}
 ```
 
 <span class="caption">示例 12-13：将 `Config` 和 `run` 移动到 *src/lib.rs*</span>