HTML tags that are out of place in Developer Guide

[imaginarys96]

Description

The Developer Guide contains some HTML tags that are out of place

Steps to Reproduce

1. Go to https://ay2324s1-cs2113-w12-1.github.io/tp/DeveloperGuide.html#acknowledgements
2. You should see under a few </li> tags under the Acknowledgement section

Expected Output
No HTML tags

Actual Output