Describe the issue linked to the documentation

The tutorial about Unsupervised learning in the development version is missing images from the K-means clustering example. This is not the case for the stable version.
The changes in #24692 join all the plots in one figure.

Suggest a potential alternative/fix

We already had a similar issue in the past, #22061, and it was decided to regenerate the images.
My opinion is that getting rid of the links to the missing images should be enough in this case.