Fix typos discovered by codespell

Author: cclauss

simple_history/management/commands/clean_duplicate_history.py

@@ -8,7 +8,7 @@
 class Command(populate_history.Command):
     args = "<app.model app.model ...>"
     help = (
-        "Scans HistoricalRecords for identical sequencial entries "
+        "Scans HistoricalRecords for identical sequential entries "
         "(duplicates) in a model and deletes them."
     )
 

simple_history/models.py

@@ -672,7 +672,7 @@ def post_delete(self, instance, using=None, **kwargs):
 
     def pre_delete(self, instance, **kwargs):
         """
-        pre_delete method to ensure all deferred fileds are loaded on the model
+        pre_delete method to ensure all deferred fields are loaded on the model
         """
         # First check that history is enabled (on model and globally)
         if not getattr(settings, "SIMPLE_HISTORY_ENABLED", True):