DOC add_reflection(h,k,l) will use current positions

[prjemian]

Note in the documentation that add_reflection(h,k,l) will use the current positions if positions=None (the default):

hklpy/hkl/sample.py

Lines 301 to 320 in 906f00e

	def add_reflection(self, h, k, l, position=None, detector=None, compute_ub=False):
	"""Add a reflection, optionally specifying the detector to use
	Parameters
	----------
	h : float
	Reflection h
	k : float
	Reflection k
	l : float
	Reflection l
	detector : Hkl.Detector, optional
	The detector
	position : tuple or namedtuple, optional
	The physical motor position that this reflection corresponds to
	If not specified, the current geometry of the calculation engine is
	assumed.
	compute_ub : bool, optional
	Calculate the UB matrix with the last two reflections
	"""