ticdc: add a faq (#5411)
ticdc: add a faq (#5411)

* update faq

* update

* Apply suggestions from code review

Co-authored-by: TomShawn <3d0966147538bc5ab020e8dffa2c0b746f9728a6@users.noreply.github.com>

* Apply suggestions from code review

* Update ticdc/ticdc-overview.md

* Update ticdc/ticdc-overview.md

* Update ticdc/ticdc-overview.md

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