Update S4 point of contact in docs

[DavidHuber-NOAA]

Description

Update the point of contact for global workflow issues on S4.

Type of change

• Documentation update

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [x] New and existing tests pass with my changes
• [x] I have made corresponding changes to the documentation if necessary