Update 0098-validate-binary-search-tree.md

Author: ajay-dhangar

dsa-solutions/lc-solutions/0000-0099/0098-validate-binary-search-tree.md

@@ -1,5 +1,5 @@
 ---
-id: validate binary search tree
+id: validate-binary-search-tree
 title: Validate Binary Search Tree
 sidebar_label: 0098 Validate Binary Search Tree
 tags:
@@ -40,7 +40,7 @@ Output: false
 ### Constraints
 
 - The number of nodes in the tree is in the range $[1, 10^4]$.
-- `-2^(31) <= Node.val <= 2^(31) - 1.`
+- $-2^(31) \leq \text{Node.val} \leq 2^(31) - 1$.
 
 ### Approach