tools: added a checklist for debugging speed problem (#754)
tools: added a checklist for debugging speed problem (#754)

* lightning: added a checklist for debugging speed problem

* Update tools/lightning-errors.md

Co-Authored-By: kennytm <d10ee62456d8e2be8715605d23b69b7662d1915a@gmail.com>

* Update tools/lightning-errors.md

Co-Authored-By: kennytm <d10ee62456d8e2be8715605d23b69b7662d1915a@gmail.com>

* Update tools/lightning-errors.md

Co-Authored-By: kennytm <d10ee62456d8e2be8715605d23b69b7662d1915a@gmail.com>

pingcap/docs,pingcap/docs,pingcap/docs