Description

Add examples to show for each of these functions:

• skimage.morphology.square(width[, dtype])
• skimage.morphology.rectangle(width, height)
• skimage.morphology.diamond(radius[, dtype])
• skimage.morphology.disk(radius[, dtype])
• skimage.morphology.cube(width[, dtype])
• skimage.morphology.octahedron(radius[, dtype])
• skimage.morphology.ball(radius[, dtype])
• skimage.morphology.octagon(m, n[, dtype])
• skimage.morphology.star(a[, dtype])

the typical shape of the structuring element.

Cc ( @emmanuelle : another first issue idea).