Fix Closing Tag Typo in README.md (#10039)

Description:
I noticed a typo in the README.md file where the closing tag for the header was incorrectly written as `</h2>` instead of `</h3>`. 

Changes Made:
- Corrected the closing tag for the header from `</h2>` to `</h3>`.

Location:
- File: README.md
- Line: 6

This fix improves the readability and consistency of the documentation. Please review and merge at your convenience.

Thank you

README.md

@@ -3,7 +3,7 @@
   <br />
   <br />
   Akamai Connected Cloud Manager
-</h2>
+</h3>
 
 <p align="center">
   <img alt="Linode Manager Code Coverage" src="https://cloud-manager-coverage.us-east-1.linodeobjects.com/badges.svg?v=1" />
@@ -56,4 +56,4 @@ To report a bug or request a feature in Cloud Manager, please [open a GitHub Iss
 ## License
 
 All code located in this repository is distributed under the terms of the [APLv2
-license](LICENSE).
+license](LICENSE).