refactor: write 'duplicate' instead of 'duplicity'

app/services/bulk_upload/lettings/year2022/row_parser.rb

@@ -394,7 +394,7 @@ class BulkUpload::Lettings::Year2022::RowParser
   end
 
   def log_already_exists?
-    LettingsLog.exists?(duplicity_check_fields.index_with { |field| log.public_send(field) })
+    LettingsLog.exists?(duplicate_check_fields.index_with { |field| log.public_send(field) })
   end
 
 private
@@ -441,7 +441,7 @@ private
     @created_by ||= User.find_by(email: field_112)
   end
 
-  def duplicity_check_fields
+  def duplicate_check_fields
     %w[
       startdate
       age1

app/services/bulk_upload/lettings/year2023/row_parser.rb

@@ -399,7 +399,7 @@ class BulkUpload::Lettings::Year2023::RowParser
   end
 
   def log_already_exists?
-    LettingsLog.exists?(duplicity_check_fields.index_with { |field| log.public_send(field) })
+    LettingsLog.exists?(duplicate_check_fields.index_with { |field| log.public_send(field) })
   end
 
 private
@@ -452,7 +452,7 @@ private
     end
   end
 
-  def duplicity_check_fields
+  def duplicate_check_fields
     %w[
       startdate
       age1

spec/services/bulk_upload/lettings/year2022/row_parser_spec.rb

@@ -226,7 +226,7 @@ RSpec.describe BulkUpload::Lettings::Year2022::RowParser do
             expect(parser).not_to be_valid
           end
 
-          it "adds an error to all (and only) the fields used to determine duplicity" do
+          it "adds an error to all (and only) the fields used to determine duplicates" do
             parser.valid?
 
             error_message = "This is a duplicate log"

spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb

@@ -246,7 +246,7 @@ RSpec.describe BulkUpload::Lettings::Year2023::RowParser do
             expect(parser).not_to be_valid
           end
 
-          it "adds an error to all (and only) the fields used to determine duplicity" do
+          it "adds an error to all (and only) the fields used to determine duplicates" do
             parser.valid?
 
             error_message = "This is a duplicate log"