Update the book based on the revised second edition (#1014)

* Revised the book

* Update the book with the second revised edition

* Revise base on the manuscript of the first edition

codes/csharp/chapter_hashing/hash_map.cs

@@ -24,7 +24,7 @@ public class hash_map {
         PrintUtil.PrintHashMap(map);
 
         /* 查询操作 */
-        // 向哈希表输入键 key ，得到值 value
+        // 向哈希表中输入键 key ，得到值 value
         string name = map[15937];
         Console.WriteLine("\n输入学号 15937 ，查询到姓名 " + name);