Mauro Carvalho Chehab 77ce1a47eb docs: filesystems: add overlayfs to index.rst
While the document is there, it is currently missing at the
index file.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/3b8e7783b1fcc71e4f94af5ea8e5fa264392f8c4.1580193653.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2020-01-28 13:41:57 -07:00
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