update: fix entries in readme

Author: ashokdey

README.md

@@ -37,9 +37,9 @@ Collection of interview questions with Unit Tests. Problems includes Data Struct
 - [Doubly Linked List](src/_DataStructures_/DoublyLinkedList)
 
 - [Trees](src/_DataStructures_/Trees)
-  - [Binary Search Tree](src/_DataStructures_/Trees/BST)
-    - [Find k<sup>th</sup> maximum in a BST](src/_DataStructures_/Trees/BST/find-kth-max)
-    - [Find k<sup>th</sup> minimum in a BST](src/_DataStructures_/Trees/BST/find-kth-min)
+  - [Binary Search Tree](src/_DataStructures_/Trees/BinarySearchTree)
+    - [Find k<sup>th</sup> maximum in a BinarySearchTree](src/_DataStructures_/Trees/BinarySearchTree/find-kth-max)
+    - [Find k<sup>th</sup> minimum in a BinarySearchTree](src/_DataStructures_/Trees/BinarySearchTree/find-kth-min)
   - [Suffix Tree](src/_DataStructures_/SuffixTree)
 
 ### Logical Problems