chore: merge server-changes notes into one

Author: kathiekiwi

.server-changes/billing-alerts-preview-stale-limit.md

@@ -3,4 +3,4 @@ area: webapp
 type: improvement
 ---
 
-Organizations without billing alerts now get sensible default spend alert thresholds automatically, so you're notified before usage grows unexpectedly. You can adjust or remove them anytime in billing settings.
+Organizations without billing alerts now get default spend alert thresholds, so you're notified before usage grows unexpectedly. The billing limit page no longer pre-selects an option before you've set a limit and prompts you to configure one. Alert previews now update immediately after you change your billing limit.