Incorrect Voronoi bounds from DimensionCoordinate.create_bounds for cyclic coordinates #514
Description
At version 3.13.1, incorrect Voronoi bounds are created from DimensionCoordinate.create_bounds for cyclic and period coordinates.
>>> import cf
>>> cf.__version__
'3.13.1'
>>> d = cf.DimensionCoordinate(data=[180, 90, 40, 0.0])
>>> d.period(360)
>>> d.cyclic(0)
set()
>>> b = d.create_bounds()
>>> print(b.array)
[[225. 135.] # Wrong
[135. 65.]
[ 65. 20.]
[ 20. -20.]] # Wrongwhen the result should be
[[270. 135.] # Correct
[135. 65.]
[ 65. 20.]
[ 20. -90.]] # CorrectAlso, the docstring for the method is lacking in detail.