CLDC-3986: Update column A text on BU pages (#3037)

* Reword instructions on column A, prepare your file views

* Reword instructions on column A, shared guidance view

* Reword instructions for data entry in the file preparation template

* Reword guidance on data entry to clarify starting column for data

app/views/bulk_upload_lettings_logs/forms/prepare_your_file.html.erb

@@ -20,7 +20,7 @@
       <h2 class="govuk-heading-s">Create your file</h2>
 
       <%= govuk_list [
-        "Fill in the template with data from your housing management system. Your data should go below the headers, with one row per log. Leave column A blank - the bulk upload fields start in column B.",
+        "Fill in the template with data from your housing management system. Your data should go below the headers, with one row per log - your data should start in column B.",
         "Make sure each column of your data aligns with the matching headers above. You may need to reorder your data.",
         "Use the #{govuk_link_to "Lettings bulk upload Specification (#{@form.year_combo})", @form.specification_path} to check your data is in the correct format.".html_safe,
         "<strong>Username field:</strong> To assign a log to someone else, enter the email address they use to log into CORE.".html_safe,

app/views/bulk_upload_sales_logs/forms/prepare_your_file.html.erb

@@ -20,7 +20,7 @@
 
       <h2 class="govuk-heading-s">Create your file</h2>
       <%= govuk_list [
-        "Fill in the template with data from your housing management system. Your data should go below the headers, with one row per log. The bulk upload fields start at column B. Leave column A blank.",
+        "Fill in the template with data from your housing management system. Your data should go below the headers, with one row per log - your data should start in column B.",
         "Make sure each column of your data aligns with the matching headers above. You may need to reorder your data.",
         "Use the #{govuk_link_to "Sales bulk upload Specification (#{@form.year_combo})", @form.specification_path} to check your data is in the correct format.".html_safe,
         "<strong>Username field:</strong> To assign a log to someone else, enter the email address they use to log into CORE.".html_safe,

app/views/bulk_upload_shared/guidance.html.erb

@@ -32,7 +32,7 @@
 
         <%= govuk_list ["the CORE form questions and their field numbers", "each field’s valid responses", "if/when certain fields can be left blank", "which fields are used to check for duplicate logs"], type: :bullet %>
 
-        <p class="govuk-body">You can paste your data below the headers or copy the headers and insert them above the data in your file. The bulk upload fields start at column B. Leave column A blank.</p>
+        <p class="govuk-body">You can paste your data below the headers or copy the headers and insert them above the data in your file - your data should start in column B.</p>
         <p class="govuk-body">Make sure that each column of data aligns with the corresponding question in the headers. We recommend ordering your data to match the headers, but you can also reorder the headers to match your data. When processing the file, we check what each column of data represents based on the headers above.</p>
         <p class="govuk-body"><%= govuk_link_to "Download the lettings bulk upload template (#{@form.year} to #{@form.year + 1})", @form.lettings_template_path %></p>
         <p class="govuk-body"><%= govuk_link_to "Download the sales bulk upload template (#{@form.year} to #{@form.year + 1})", @form.sales_template_path %></p>