Add S3 plugin to the list of file system plugin in doc (add_filesys.md) (#16920)
Add S3 plugin to the list of file system plugin in doc (add_filesys.md) (#16920)

This fix adds S3 plugin to the list of file system plugin in
doc (add_filesys.md).

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>
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