Pass ESLint validations: Events Example

Problem/Motivation

At #3417482: [Meta] Pass Eslint validations we are aiming to have all the eslint validation checks passing for the Examples module.

On this issue, we'll be focused on the events_example sub-module

Initial errors detected by 27/01/2024

/modules/events_example/events_example.services.yml
   9:3  error  Expected line before comment  lines-around-comment
  12:5  error  Expected line before comment  lines-around-comment

Proposed resolution

1. Check the parent issue for detailed instructions about how to run eslint locally
2. Run eslint against the submodule: events_example
3. Fix the issues found and make a MR with the fixes.