ABI: sysfs-devices-removable: make a table valid as ReST markup

ABI: sysfs-devices-removable: make a table valid as ReST markup

Changeset 70f400d4d957 ("driver core: Move the "removable" attribute from USB to core")
added a table to the file, but not using a valid ReST format.

Change it to avoid build issues when producing documentation with
"make htmldocs".

Fixes: 70f400d4d957 ("driver core: Move the "removable" attribute from USB to core")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/bf83354747b8abaa486fe03af4be2826363469cb.1632740376.git.mchehab+huawei@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>