Minor fix to clarify user-provided position angle instead of roll (#96) #467

Job	Run time
Download data	14s
check / Load tox environments	4s
check / check-style (ubuntu-latest)	14s
test / Load tox environments	4s
test / py39-oldestdeps-cov-xdist (ubuntu-latest)	4m 50s
test / py39-xdist (ubuntu-latest)	4m 21s
test / py310-xdist (ubuntu-latest)	5m 6s
test / py3-xdist (ubuntu-latest)	4m 29s
test / py3-xdist (macos-latest)	6m 17s
test / py3-pyargs-xdist (ubuntu-latest)	8m 49s
test / py3-cov-xdist (ubuntu-latest)	5m 18s
	39m 46s

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