Several bug fixes.

docs/chapter_array_and_linkedlist/linked_list.md

@@ -22,7 +22,7 @@
     class ListNode:
         """链表节点类"""
         def __init__(self, val: int):
-            self.val: int = val                  # 节点值
+            self.val: int = val               # 节点值
             self.next: ListNode | None = None # 指向下一节点的引用
     ```
 
@@ -739,7 +739,7 @@
     class ListNode:
         """双向链表节点类"""
         def __init__(self, val: int):
-            self.val: int = val                   # 节点值
+            self.val: int = val                # 节点值
             self.next: ListNode | None = None  # 指向后继节点的引用
             self.prev: ListNode | None = None  # 指向前驱节点的引用
     ```

docs/chapter_computational_complexity/space_complexity.md

@@ -28,7 +28,7 @@
     class Node:
         """类"""
         def __init__(self, x: int):
-            self.val: int = x                 # 节点值
+            self.val: int = x              # 节点值
             self.next: Node | None = None  # 指向下一节点的引用
 
     def function() -> int:

docs/chapter_tree/avl_tree.md

@@ -26,8 +26,8 @@ AVL 树既是二叉搜索树也是平衡二叉树，同时满足这两类二叉
     class TreeNode:
         """AVL 树节点类"""
         def __init__(self, val: int):
-            self.val: int = val                    # 节点值
-            self.height: int = 0                   # 节点高度
+            self.val: int = val                 # 节点值
+            self.height: int = 0                # 节点高度
             self.left: TreeNode | None = None   # 左子节点引用
             self.right: TreeNode | None = None  # 右子节点引用
     ```

docs/chapter_tree/binary_tree.md

@@ -8,7 +8,7 @@
     class TreeNode:
         """二叉树节点类"""
         def __init__(self, val: int):
-            self.val: int = val                   # 节点值
+            self.val: int = val                # 节点值
             self.left: TreeNode | None = None  # 左子节点引用
             self.right: TreeNode | None = None # 右子节点引用
     ```