Erroneous examples for rotateby

[RMeli]

The examples in the documentation of transforms.rotate.rotateby are not up-to-date since they call transformations.rotate instead of transforms.rotate.rotateby.

mdanalysis/package/MDAnalysis/transformations/rotate.py

Lines 41 to 70 in 3ea6e43

	def rotateby(angle, direction, point=None, ag=None, weights=None, wrap=False):
	'''
	Rotates the trajectory by a given angle on a given axis. The axis is defined by
	the user, combining the direction vector and a point. This point can be the center
	of geometry or the center of mass of a user defined AtomGroup, or an array defining
	custom coordinates.
	Examples
	--------
	e.g. rotate the coordinates by 90 degrees on a axis formed by the [0,0,1] vector and
	the center of geometry of a given AtomGroup:
	.. code-block:: python
	ts = u.trajectory.ts
	angle = 90
	ag = u.atoms()
	d = [0,0,1]
	rotated = MDAnalysis.transformations.rotate(angle, direction=d, ag=ag)(ts)
	e.g. rotate the coordinates by a custom axis:
	.. code-block:: python
	ts = u.trajectory.ts
	angle = 90
	p = [1,2,3]
	d = [0,0,1]
	rotated = MDAnalysis.transformations.rotate(angle, direction=d, point=point)(ts)

I'll provide a quick fix.

[orbeckst]

Thanks, @RMeli !