Where did "edit source" go? (using panels as templates)

im following an old tutorial and something important has changed. in his blender version, he can right click things in panels, and underneath “online manual” there is “edit source”, which takes him to the code of that thing (element i think its called?).

“online python reference” and “edit translation” are also missing, but i dont need these.

Please could someone tell me how to do this in 2.8?

same place, same conditions

You have to enable developers extras

thank you so much! just saved me a huge headache.