Improve docval for IndexSeries init #1858

Job	Run time
conda-linux-python3.13-ros3	1m 39s
windows-gallery-python3.13-upgraded	6m 9s
linux-gallery-python3.13-upgraded	2m 50s
windows-gallery-python3.9-minimum	3m 4s
linux-gallery-python3.9-minimum	2m 8s
linux-python3.13-upgraded	5m 42s
conda-linux-python3.9-minimum	6m 12s
windows-python3.13-upgraded	6m 17s
conda-linux-python3.13-upgraded	5m 9s
macos-python3.13-upgraded	2m 43s
linux-python3.9-minimum	7m 11s
macos-python3.9-minimum	9m 11s
conda-linux-gallery-python3.13-ros3	1m 23s
windows-python3.9-minimum	7m 12s
Deploy pre-release from dev	-1s
	1h 6m 49s

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