update document for adding a float compatibility problem's warning (#5052)
update document for adding a float compatibility problem's warning (#5052)

* add a float compatibility problem

* add a test case to explain the warning

* Update data-type-numeric.md

* Update data-type-numeric.md

Co-authored-by: TomShawn <3d0966147538bc5ab020e8dffa2c0b746f9728a6@users.noreply.github.com>
pingcap/docs-cn,pingcap/docs-cn