chore: remove comment about orbital element limits (NOAA-GFDL#1643)

Author: japhir

astronomy/astronomy.F90

@@ -468,7 +468,6 @@ subroutine astronomy_init (latb, lonb)
     endif
 !--------------------------------------------------------------------
 !>    Be sure input values are within valid ranges.
-!    QUESTION : ARE THESE THE RIGHT LIMITS ???
 !---------------------------------------------------------------------
     if (ecc < 0.0_r8_kind .or. ecc > 0.99_r8_kind) &
        call error_mesg ('astronomy_mod', &