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_heap/my_heap.cs

@@ -27,17 +27,17 @@ class MaxHeap {
         }
     }
 
-    /* 获取左子节点索引 */
+    /* 获取左子节点的索引 */
     int Left(int i) {
         return 2 * i + 1;
     }
 
-    /* 获取右子节点索引 */
+    /* 获取右子节点的索引 */
     int Right(int i) {
         return 2 * i + 2;
     }
 
-    /* 获取父节点索引 */
+    /* 获取父节点的索引 */
     int Parent(int i) {
         return (i - 1) / 2; // 向下整除
     }