Add new species constraints to user documentation

Remove maximumHydrogenAtoms since it's not actually implemented.
Change the values for the species constraints in the example
code to more reasonable values in case users use it directly.

Author: mliu49

documentation/source/users/rmg/input.rst

@@ -586,13 +586,15 @@ all of RMG's reaction families. ::
     generatedSpeciesConstraints(
         allowed=['input species','seed mechanisms','reaction libraries'],
         maximumCarbonAtoms=10,
-        maximumHydrogenAtoms=10,
-        maximumOxygenAtoms=10,
-        maximumNitrogenAtoms=10,
-        maximumSiliconAtoms=10,
-        maximumSulfurAtoms=10,
+        maximumOxygenAtoms=2,
+        maximumNitrogenAtoms=2,
+        maximumSiliconAtoms=2,
+        maximumSulfurAtoms=2,
         maximumHeavyAtoms=10,
-        maximumRadicalElectrons=10,
+        maximumRadicalElectrons=2,
+        maximumSingletCarbenes=1,
+        maximumCarbeneRadicals=0,
+        maximumIsotopicAtoms=2,
         allowSingletO2 = False,
     )