Add docs for using the family file driver with PyNWB #1309

Job	Run time
linux-gallery-python3.8-minimum	2m 20s
linux-python3.8-minimum	27m 25s
linux-gallery-python3.12-upgraded	3m 45s
linux-python3.12-upgraded	27m 24s
windows-gallery-python3.8-minimum	3m 31s
windows-python3.8-minimum	27m 13s
windows-gallery-python3.12-upgraded	5m 18s
windows-python3.12-upgraded	26m 36s
conda-linux-python3.8-minimum	23m 35s
macos-python3.8-minimum	27m 25s
conda-linux-python3.12-upgraded	22m 20s
conda-linux-gallery-python3.12-ros3	1m 33s
conda-linux-python3.12-ros3	1m 34s
Deploy pre-release from dev	1s
	3h 20m 0s

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