Documentation: Fix simple typo on filesystems/porting.rst
Just spotted this while reading the doc.
Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20241213151743.23435-1-cem@kernel.org
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