add hint text

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

@@ -6,7 +6,7 @@ class Form::Lettings::Questions::Period < ::Form::Question
     @header = "How often does the household pay rent and other charges?"
     @type = "radio"
     @check_answers_card_number = 0
-    @hint_text = ""
+    @hint_text = "Select how often the household is charged. This may be different to how often they pay."
     @answer_options = ANSWER_OPTIONS
     @question_number = 92
   end

config/forms/2022_2023.json

@@ -7443,7 +7443,7 @@
                 "period": {
                   "check_answer_label": "Frequency of household rent and charges",
                   "header": "How often does the household pay rent and other charges?",
-                  "hint_text": "",
+                  "hint_text": "Select how often the household is charged. This may be different to how often they pay.",
                   "type": "radio",
                   "answer_options": {
                     "2": {