Update Documentation for Adding a Changelog Entry
What does this MR do and why?
Minor update to the Changelog Documentation for adding a changelog entry
https://docs.gitlab.com/ee/development/changelog.html#how-to-generate-a-changelog-entry
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.