DOC: adapt a docstest for numpy 2 (representation of scalars changed) #379

Job	Run time
ubuntu-py38-oldestdeps	1m 28s
macos-py310-astroscrappy11	1m 17s
ubuntu-py39	1m 9s
ubuntu-py39-bottleneck	1m 10s
ubuntu-py310	1m 27s
macos-py39	1m 23s
windows-py310	1m 13s
ubuntu-codestyle	17s
ubuntu-build_docs	1m 20s
ubuntu-py310-test-alldeps-devdeps	1m 28s
	12m 12s

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