Update docs on the existing lookup proof generation

[kevinlewi]

We should indicate that the existing lookup proof generation / verification should be deprecated, and history proofs with MostRecent(1) should be used instead

[HEGAMO-369]

We should indicate that the existing lookup proof generation / verification should be deprecated, and history proofs with MostRecent(1) should be used instead

Hello, excellent day, and excellent work that has been done (my proposal guided me to carry out the test, I cannot be wrong, my state at the moment is a little delicate in health derived from Work accidents that limited me from working and without receiving the economy of personal support and the little experience to carry out this longed-for test) I apologize for this writing.

[DarbydaGOD1]

#446