Drop the doubled word "be".

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20200703214325.31036-4-rdunlap@infradead.org


Signed-off-by: Jonathan Corbet <corbet@lwn.net>