fix date of ChangeLog entry

doc/ChangeLog

@@ -2,12 +2,13 @@
 
 Tag name: cam6_4_021
 Originator(s): jet
-Date: 8 Aug 2024
+Date: 16 Aug 2024
 One-line Summary: CCPPize dadadj
 Github PR URL: https://github.com/ESCOMP/CAM/pull/1026
 
 Purpose of changes (include the issue number and title text for each relevant GitHub issue):
   - Issue #928 - Convert Dry Adiabatic Adjustment to CCPP and move into the atmospheric_physics github repo
+  - Bugfix to dadadj although it didn't change answers in the regression suite.
 
 Describe any changes made to build system: add atmos_phys/dry_adiabatic_adjust directory to build filepath