Fix typos in Python files

rest_framework/fields.py

@@ -1614,7 +1614,7 @@ class JSONField(Field):
     def get_value(self, dictionary):
         if html.is_html_input(dictionary) and self.field_name in dictionary:
             # When HTML form input is used, mark up the input
-            # as being a JSON string, rather than a JSON primative.
+            # as being a JSON string, rather than a JSON primitive.
             class JSONString(six.text_type):
                 def __new__(self, value):
                     ret = six.text_type.__new__(self, value)

rest_framework/serializers.py

@@ -1177,7 +1177,7 @@ class ModelSerializer(Serializer):
 
         if postgres_fields and isinstance(model_field, postgres_fields.ArrayField):
             # Populate the `child` argument on `ListField` instances generated
-            # for the PostgrSQL specfic `ArrayField`.
+            # for the PostgreSQL specific `ArrayField`.
             child_model_field = model_field.base_field
             child_field_class, child_field_kwargs = self.build_standard_field(
                 'child', child_model_field