EAMxx: update docs to reflect cosp behavior

Author: mahf708

components/eamxx/docs/user/cosp.md

@@ -55,7 +55,6 @@ fields:
     - isccp_ctptau
     - modis_ctptau
     - misr_cthtau
-    - cosp_sunlit
 max_snapshots_per_file: 1
 filename_prefix: eamxx
 output_control:
@@ -76,19 +75,3 @@ The following output fields are available:
       - MODIS-simulated cloud top pressure/optical depth joint histogram
 - `misr_cthtau`
       - MISR-simulated cloud top height/optical depth joint histogram
-- `cosp_sunlit`
-      - sunlit flag aggregated at COSP frequency for renormalizing daytime averages
-
-ISCCP, MODIS, and MISR outputs are valid only for daytime/sunlit columns
-(to be consistent with available satellite retrievals).
-In order to aggregate only daytime columns in time averages, these outputs are
-multiplied by the sunlit flag (0 or 1) at each COSP calculation time.
-Time averages of these quantities are then aggregated, along with the COSP
-sunlit flag each time COSP is called.
-In order to back out the daytime-only time averages from the outputs,
-one needs to divide the output fields by `cosp_sunlit`.
-E.g.,
-
-```shell
-isccp_ctptau = mean(isccp_ctptau) / mean(cosp_sunlit)
-```