fix: value_2 typo error in section 3.1 (changkun#37)

Grace0926 · changkun · commit d7e934a4d3f5 · 2018-08-15T18:38:28.000+02:00
diff --git a/code/3/3.1.cpp b/code/3/3.1.cpp
@@ -29,7 +29,7 @@ void learn_lambda_func_2() {
     value_2 = 100;
     auto stored_value_2 = copy_value_2();
     std::cout << "stored_value_2=" << stored_value_2 << std::endl;
-    // 这时, stored_value_2 == 100, value_1 == 100.
+    // 这时, stored_value_2 == 100, value_2 == 100.
     // 因为 copy_value_2 保存的是引用
 }
 

Original file line number	Diff line number	Diff line change
`@@ -29,7 +29,7 @@ void learn_lambda_func_2() {`
`29`	`29`	`value_2 = 100;`
`30`	`30`	`auto stored_value_2 = copy_value_2();`
`31`	`31`	`std::cout << "stored_value_2=" << stored_value_2 << std::endl;`
`32`		`- // 这时, stored_value_2 == 100, value_1 == 100.`
	`32`	`+ // 这时, stored_value_2 == 100, value_2 == 100.`
`33`	`33`	`// 因为 copy_value_2 保存的是引用`
`34`	`34`	`}`
`35`	`35`