ARROW-16093: [Python] Address docstrings in Filesystems (Python Implementations) (#13595)
ARROW-16093: [Python] Address docstrings in Filesystems (Python Implementations) (#13595)

Lead-authored-by: Alenka Frim <f50e75d4c31e511ffacbf2da8f53d7ed4bd8eabe@gmail.com>
Co-authored-by: Alenka Frim <8038d3bf0071eeb1f277c41143a0e5ebfaaebff9@users.noreply.github.com>
Signed-off-by: Antoine Pitrou <9359a4d812173b65a3a0094cd86363e79731a3c2@python.org>
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