Update observer_overhaul.md to have more double quotes (#20973)

# Objective

- cart and jondolf are not one person (or so they would have us
believe...)

## Solution

- have two author strings for them

## Testing

-

Author: atlv24

release-content/release-notes/observer_overhaul.md

@@ -1,6 +1,6 @@
 ---
 title: Event / Observer Overhaul
-authors: ["@cart, @Jondolf", "@alice-i-cecile", "@hukasu", "oscar-benderstone", "Zeophlite", "gwafotapa"]
+authors: ["@cart", "@Jondolf", "@alice-i-cecile", "@hukasu", "@oscar-benderstone", "@Zeophlite", "@gwafotapa"]
 pull_requests: [20731, 19596, 19663, 19611, 19935, 20274]
 ---