Add documentation for SpikeEventSeries #1422

Job	Run time
linux-gallery-python3.8-minimum	1m 35s
linux-gallery-python3.12-upgraded	1m 39s
windows-gallery-python3.8-minimum	1m 27s
windows-gallery-python3.12-upgraded	1m 26s
linux-python3.8-minimum	1m 34s
linux-python3.12-upgraded	1m 34s
windows-python3.8-minimum	1m 27s
windows-python3.12-upgraded	1m 27s
macos-python3.8-minimum	1m 33s
conda-linux-gallery-python3.12-ros3	1m 22s
conda-linux-python3.12-ros3	1m 21s
conda-linux-python3.8-minimum	1m 35s
conda-linux-python3.12-upgraded	1m 35s
Deploy pre-release from dev	1s
	19m 36s

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