remember to add "position" to help text for 'ghosts' in "Launch-0" workflow

[MrtnKk]

Add "position" to the phrase

These smudges may appear to change brightness or size over time.

Change to

These smudges may appear to change brightness, size and position over time.

The help text can be found by clicking on the "Need some help with this task?" link in the classify screen. The section is headlined "non-mover (false positive) examples"