Documentation: s390/vfio-ap: eliminate duplicated word

Drop the doubled word "the".
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Tony Krowiak <akrowiak@linux.ibm.com>
Cc: Pierre Morel <pmorel@linux.ibm.com>
Cc: Halil Pasic <pasic@linux.ibm.com>
Cc: linux-s390@vger.kernel.org
Link: https://lore.kernel.org/r/20200707180414.10467-17-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/s390/vfio-ap.rst

@@ -361,7 +361,7 @@ matrix device.
     assign_domain / unassign_domain:
       Write-only attributes for assigning/unassigning an AP usage domain to/from
       the mediated matrix device. To assign/unassign a domain, the domain
-      number of the the usage domain is echoed to the respective attribute
+      number of the usage domain is echoed to the respective attribute
       file.
     matrix:
       A read-only file for displaying the APQNs derived from the cross product