doc: fix doc string formatting

Author: beckermr

jax_galsim/gsobject.py

@@ -582,7 +582,7 @@ def _determine_wcs(self, scale, wcs, image, default_wcs=None):
   to indicate no limit on the extra noise
 - requires that the ``maxN`` option be a constant since PhotonArrays are allocated
   with ``maxN`` photons when this option is used and arrays in JAX must have static sizes.
-- raises generic ``Exception``s instead of more specific exceptions for some invalid inputs
+- raises a generic ``Exception`` instead of a more specific exception for some invalid inputs
 """,
     )
     def drawImage(
@@ -1118,7 +1118,7 @@ def _calculate_nphotons(self, n_photons, poisson_flux, max_extra_noise, rng):
 - uses a default of ``n_photons=None`` instead of ``n_photons=0``
 - uses a default of ``max_extra_noise=None`` instead of ``max_extra_noise=0``
   to indicate no limit on the extra noise
-- raises generic ``Exception``s instead of more specific exceptions for some invalid inputs
+- raises a generic ``Exception`` instead of a more specific exception for some invalid inputs
 """,
     )
     def makePhot(
@@ -1189,7 +1189,7 @@ def makePhot(
   from the flux and gain
 - uses a default of ``max_extra_noise=None`` instead of ``max_extra_noise=0``
   to indicate no limit on the extra noise
-- raises generic ``Exception``s instead of more specific exceptions for some invalid inputs
+- raises a generic ``Exception`` instead of a more specific exception for some invalid inputs
 - requires that the ``maxN`` option must be a constant
 """,
     )