Always add FCHIST_GC test to pre-existing failures in ChangeLog

Author: hplin-ucar

doc/ChangeLog

@@ -77,6 +77,7 @@ derecho/intel/aux_cam:
   SMS_Ln9.ne30pg3_ne30pg3_mg17.FW2000climo.derecho_intel.cam-outfrq9s_rrtmgp (Overall: DIFF) details:
     - diagnostic changes (IWC, LWC, AWNC, AWNI) only due to change of magic number to rair
 
+  SMS_Ld1.f09_f09_mg17.FCHIST_GC.derecho_intel.cam-outfrq1d (Overall: DIFF) details:
   ERP_Ln9.f09_f09_mg17.FCSD_HCO.derecho_intel.cam-outfrq9s (Overall: FAIL) details:
     FAIL ERP_Ln9.f09_f09_mg17.FCSD_HCO.derecho_intel.cam-outfrq9s COMPARE_base_rest
     - pre-existing failures due to HEMCO not having reproducible results (issues #1018 and #856)