Add the changelog note for impossible wildfire acquisition dates.

Co-authored-by: Cursor <[email protected]>

changelog.d/1342-firms-acquisition-calendar.md

@@ -1,3 +1,3 @@
-- Keep an impossible wildfire acquisition date untimed, so 30 February is not
-  shown as a detection two days later
+- Keep an impossible wildfire acquisition date off the detection clock, so a
+  fire is not labeled with a later day it did not happen
   (Rudy Celekli, @rudycelekli, #1342).