Fix typo and add text in comments

Simulation_engine/lexception.py

-# The LexCeption exception is raised when an error occcurs within a
+# The LexCeption exception is raised when an error occurs within a
 # simulation. It is used to dispatch the error message to the client,
-# so messages should be clear for an external API user.
+# so messages should be clear for an external Web API user.
 
 
 class LexCeption(Exception):

Simulation_engine/reformePLF.py

@@ -39,7 +39,7 @@ reforme_base = {
                 {"veuf": 6, "mariesOuPacses": 6, "celibataire": 5, "divorce": 5},
                 {"veuf": 7, "mariesOuPacses": 7, "celibataire": 6, "divorce": 6},
             ],
-            "partsParPACAuDela": 1,  # LE "Et ainsi de suite..."
+            "partsParPACAuDela": 1,  # Le "Et ainsi de suite..." pour toute PAC au-delà du tableau "partsSelonNombrePAC".
             "partsParPACChargePartagee": {  # On a maintenant 12 cas différents en fonction du nobre d'enfants.
                 "zeroChargePrincipale": {"deuxPremiers": 0.25, "suivants": 0.5},
                 "unChargePrincipale": {"premier": 0.25, "suivants": 0.5},