Update Entities.md
Update Entities.md

Added sentence explaining how to Undelete a soft-deleted record.
ryancyq/aspnetboilerplate,aspnetboilerplate/aspnetboilerplate,luchaoshuai/aspnetboilerplate,aspnetboilerplate/aspnetboilerplate,ryancyq/aspnetboilerplate,aspnetboilerplate/aspnetboilerplate,aspnetboilerplate/aspnetboilerplate,ryancyq/aspnetboilerplate,ryancyq/aspnetboilerplate,luchaoshuai/aspnetboilerplate