Fix day-2 running_order, David (#362)

This is the order of `running_order`s:

0. [opening-session](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/1-opening-session.md)
1. [opening-keynote-eileen](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/opening-keynote-eileen.md)
2. [stephen-margheim](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/stephen-margheim.md)
3. [ridhwana-khan](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/ridhwana-khan.md)
4. [lunch-and-breaks](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/lunch-and-breaks.md)
5. [chris-power](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/chris-power.md)
6. [miles-mcguire](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/miles-mcguire.md)
7. [andrea-fomera](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/andrea-fomera.md)
8. [bruno-prieto](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/bruno-prieto.md)
  * this is currently `6`
9. [robby-russell](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/robby-russell.md)
  * this is currently `7`
10. [xavier-noria](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/xavier-noria.md)
  * this is currently `8`
11. [julia-lopez](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/julia-lopez.md)
  * this is currently `9`
12. [obie-fernandez](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/obie-fernandez.md)
  * this is currently `10`
13. [david-henner](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/david-henner.md)
  * this is currently `11`
14. [closing-keynote-aaron](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/closing-keynote-aaron.md)
  * this is currently `12`
15. [closing-party](https://github.com/rails/website/blob/main/_world_sessions/2024/day-2/closing-party.md)
  * this is currently `13`

_world_sessions/2024/day-2/david-henner.md

@@ -4,7 +4,7 @@ title: Level up performance with simple coding changes
 speaker: david-henner.md # name of md speaker file
 time: 15:45 - 16:15
 location: Track 2
-running_order: 11
+running_order: 13
 ---
 
 This presentation will first highlight some of the major improvements Zendesk has achieved using straightforward Ruby techniques. Data will illustrate the saving of thousands of years of processing time annually, leading to increased customer satisfaction and cost-effectiveness, as reflected in our AWS bills.