CT-1776 fix typo in add_case_link_to_case method name
CT-1776 fix typo in add_case_link_to_case method name

ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff