Add documentation for SpikeEventSeries #1431

Job	Run time
conda-linux-gallery-python3.12-ros3	1m 27s
linux-gallery-python3.8-minimum	2m 7s
conda-linux-python3.12-ros3	1m 29s
linux-gallery-python3.12-upgraded	3m 21s
windows-gallery-python3.8-minimum	3m 5s
linux-python3.8-minimum	7m 24s
windows-gallery-python3.12-upgraded	5m 14s
conda-linux-python3.8-minimum	6m 26s
conda-linux-python3.12-upgraded	5m 49s
linux-python3.12-upgraded	7m 17s
windows-python3.8-minimum	7m 53s
windows-python3.12-upgraded	7m 33s
macos-python3.8-minimum	53s
Deploy pre-release from dev	0s
	59m 58s

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