Merge pull request #214 from aadiljaleel/213_fix_enum

fixes syntax bug in enum README.md by changing r2 to Color2

basic_content/enum/README.md

@@ -84,7 +84,7 @@ enum class Color2
     YELLOW,
     BLUE
 };
-r2 c2 = Color2::RED;
+Color2 c2 = Color2::RED;
 cout << static_cast<int>(c2) << endl; //必须转！
 ```
 

english/basic_content/enum/README.md

@@ -85,7 +85,7 @@ enum class Color2
     YELLOW,
     BLUE
 };
-r2 c2 = Color2::RED;
+Color2 c2 = Color2::RED;
 cout << static_cast<int>(c2) << endl; //！
 ```