feat: add hint text and update test (#1171)

app/models/form/lettings/questions/renewal.rb

@@ -6,6 +6,7 @@ class Form::Lettings::Questions::Renewal < ::Form::Question
     @header = "Is this letting a renewal?"
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
+    @hint_text = "A renewal is a letting to the same tenant in the same property"
   end
 
   ANSWER_OPTIONS = {

spec/models/form/lettings/questions/renewal_spec.rb

@@ -28,7 +28,7 @@ RSpec.describe Form::Lettings::Questions::Renewal, type: :model do
   end
 
   it "has the correct hint_text" do
-    expect(question.hint_text).to be_nil
+    expect(question.hint_text).to eq("A renewal is a letting to the same tenant in the same property")
   end
 
   it "has the correct answer_options" do