Aliasing multi-image → multiple_images
Link to alias

Reason:

Many "multi_*"/"multi-*" tags have the "multiple_*" variation aliased together, like multiple_tails, multi-tail, and multi_tail; likewise, the solo wiki has multi-image written as a shorthand for the multiple_images wiki link, so it'd make sense. Include multi_image --> multiple_images as well, for completion's sake.