update homepage spec with copy change

spec/requests/home_page_spec.rb

@@ -5,7 +5,7 @@
     VCR.use_cassette('geographical_areas#countries') do
       visit root_path
 
-      expect(page).to have_content 'Use the Trade Tariff to search for commodity codes.'
+      expect(page).to have_content 'Trade Tariff: look up commodity codes, duty and VAT rates'
       expect(page).to have_selector('meta[name="description"][content="Search for import and export commodity codes and for tax, duty and licences that apply to your goods"]', visible: false)
     end
   end