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/zig/chapter_heap/my_heap.zig

@@ -30,17 +30,17 @@ pub fn MaxHeap(comptime T: type) type {
             if (self.max_heap != null) self.max_heap.?.deinit();
         }
 
-        // 获取左子节点索引
+        // 获取左子节点的索引
         fn left(i: usize) usize {
             return 2 * i + 1;
         }
 
-        // 获取右子节点索引
+        // 获取右子节点的索引
         fn right(i: usize) usize {
             return 2 * i + 2;
         }
 
-        // 获取父节点索引
+        // 获取父节点的索引
         fn parent(i: usize) usize {
             // return (i - 1) / 2; // 向下整除
             return @divFloor(i - 1, 2);