[EDF to BIDS revision] Clarify extraction of validation information from eye-tracking data

[celprov]

• I don't understand what this eye.index('right') + 1 is doing?
  

  hcph-sops/docs/data-management/edf-to-bids.md

  Lines 225 to 229 in c370b04

  	validation_eye = (
  	f"eye{eye.index('right') + 1}"
  	if "RIGHT" in prefix
  	else f"eye{eye.index('left') + 1}"
  	)

• Also why are those lines commented in
  

  hcph-sops/code/eyetracking/eyetrackingrun.py

  Lines 283 to 287 in c370b04

  	# validation_eye = (
  	# f"eye{self.eye.index('right') + 1}"
  	# if "RIGHT" in prefix
  	# else f"eye{self.eye.index('left') + 1}"
  	# )