[RESULT][VOTE] SPIP: Add llms.txt files to Spark Documentation

[Allison Wang]

The vote passes with 9 +1s (4 binding +1s) and no -1s.

  (* = binding)
  +1:
  Gengliang Wang (*)
  Augusto Vivaldelli
  Hyukjin Kwon (*)
  Denny Lee
  Jules Damji
  Dongjoon Hyun (*)
  Kousuke Saruta (*)
  Jungtaek Lim
  Szehon Ho

  +0: None

  -1: None