fix typo

Author: Alice Bartlett

test/unit/search_api_test.rb

@@ -36,12 +36,12 @@ class SearchAPITest < ActiveSupport::TestCase
       @rummager_api.expects(:unified_search).with(filter_link: @manual_link, count: "1", fields: %w{title}).returns(@manual_search_response)
     end
 
-    should "returns search results from rummager" do
+    should "return search results from rummager" do
       search_response = @search_api.search(@search_params)
       assert_equal(@search_results, search_response.fetch(:results))
     end
 
-    should "returns manual from rummager" do
+    should "return manual from rummager" do
       search_response = @search_api.search(@search_params)
       assert_equal({title: @manual_title}, search_response.fetch(:scope))
     end