Update exercise number

Signed-off-by: NilashishC <[email protected]>

Author: NilashishC

exercises/ansible_network/2-resource-module-cisco/README.md

@@ -1,12 +1,12 @@
-# Exercise 4: Ansible Network Resource Modules - Cisco Example
+# Exercise 2: Ansible Network Resource Modules - Cisco Example
 
 **Read this in other languages**: ![uk](https://github.com/ansible/workshops/raw/devel/images/uk.png) [English](README.md)
 
 ## Table of Contents
 <!-- TOC titleSize:2 tabSpaces:2 depthFrom:1 depthTo:6 withLinks:1 updateOnSave:1 orderedList:0 skip:0 title:1 charForUnorderedList:* -->
 ## Table of Contents
 
-- [Exercise 4: Ansible Network Resource Modules - Cisco Example](#exercise-4-ansible-network-resource-modules---cisco-example)
+- [Exercise 2: Ansible Network Resource Modules - Cisco Example](#exercise-4-ansible-network-resource-modules---cisco-example)
   - [Table of Contents](#table-of-contents)
   - [Table of Contents](#table-of-contents-1)
   - [Objective](#objective)