Documentation: misc/xilinx_sdfec: eliminate duplicated word

Drop the doubled word "the".

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Dragan Cvetic <dragan.cvetic@xilinx.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Derek Kiernan <derek.kiernan@xilinx.com>
Cc: Dragan Cvetic <dragan.cvetic@xilinx.com>
Link: https://lore.kernel.org/r/20200707180414.10467-15-rdunlap@infradead.org


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