chore(guide): fix migration schema

Author: mydearxym

priv/repo/migrations/20210626054616_create_guide_document.exs

@@ -3,7 +3,7 @@ defmodule GroupherServer.Repo.Migrations.CreateGuideDocument do
 
   def change do
     create table(:guide_documents) do
-      add(:radar_id, references(:cms_radars, on_delete: :delete_all), null: false)
+      add(:guide_id, references(:cms_guides, on_delete: :delete_all), null: false)
       add(:body, :text)
       add(:body_html, :text)
       add(:markdown, :text)