Update comment on number concentration calculation to be clearer and …

…clarify we have another check later in physics_update().

src/physics/cam/yog_intr.F90

@@ -232,10 +232,10 @@ subroutine yog_tend(ztodt, state, ptend)
    call outfld('YOGDLIQ ',ptend%q(1,1,ixcldliq) ,pcols   ,lchnk   )
    call outfld('YOGPREC ',yog_precsfc ,pcols   ,lchnk   )
 
-   ! Update the number concentration tendencies for liquid and ice species
-   ! Values taken to match those in the `clubb_tend_cam()` subroutine
-   ! YOG can produce negative number tendency, but we must ensure it doesn't reduce total
-   ! number concentration below 0.0
+   ! Update the number concentration tendencies for liquid and ice species for all cells
+   ! Match calculations in the `clubb_tend_cam()` subroutine
+   ! YOG could produce negative number tendency, so we ensure it doesn't reduce total
+   ! number concentration below 0.0 - note that a check on this is also made in physics_update()
    call cnst_get_ind('NUMLIQ', ixnumliq)
    call cnst_get_ind('NUMICE', ixnumice)
    do k = 1, pver