Use not found instead of 404 for spec descriptions

engines/dfc_provider/spec/controllers/dfc_provider/api/catalog_items_controller_spec.rb

@@ -73,7 +73,7 @@ describe DfcProvider::Api::CatalogItemsController, type: :controller do
         context 'without a recorded enterprise' do
           let(:enterprise) { create(:enterprise) }
 
-          it 'returns not_found head' do
+          it 'is not found' do
             api_get :index, enterprise_id: 'default'
             expect(response.status).to eq 404
           end
@@ -140,7 +140,7 @@ describe DfcProvider::Api::CatalogItemsController, type: :controller do
                       id: create(:simple_product).variants.first.id
             end
 
-            it 'returns a 404 error' do
+            it 'is not found' do
               expect(response.status).to eq 404
             end
           end

engines/dfc_provider/spec/controllers/dfc_provider/api/enterprises_spec.rb

@@ -43,7 +43,7 @@ describe DfcProvider::Api::EnterprisesController, type: :controller do
           context 'given with a wrong id' do
             before { api_get :show, id: 999 }
 
-            it 'returns 404' do
+            it 'is not found' do
               expect(response.status).to eq 404
             end
           end

engines/dfc_provider/spec/controllers/dfc_provider/api/persons_controller_spec.rb

@@ -38,7 +38,7 @@ describe DfcProvider::Api::PersonsController, type: :controller do
         context 'with an other user id' do
           before { api_get :show, id: create(:user).id }
 
-          it 'returns 404' do
+          it 'is not found' do
             expect(response.status).to eq 404
           end
         end

engines/dfc_provider/spec/controllers/dfc_provider/api/supplied_products_controller_spec.rb

@@ -44,7 +44,7 @@ describe DfcProvider::Api::SuppliedProductsController, type: :controller do
           context 'given with a wrong id' do
             before { api_get :show, id: 999 }
 
-            it 'returns 404' do
+            it 'is not found' do
               expect(response.status).to eq 404
             end
           end