Documentation/driver-api: ntb: drop doubled word

Drop the doubled word "with".
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Jon Mason <jdmason@kudzu.us>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Allen Hubbe <allenbh@gmail.com>
Cc: linux-ntb@googlegroups.com
Link: https://lore.kernel.org/r/20200704034502.17199-13-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/driver-api/ntb.rst

@@ -9,7 +9,7 @@ registers and memory translation windows, as well as non common features like
 scratchpad and message registers. Scratchpad registers are read-and-writable
 registers that are accessible from either side of the device, so that peers can
 exchange a small amount of information at a fixed address. Message registers can
-be utilized for the same purpose. Additionally they are provided with with
+be utilized for the same purpose. Additionally they are provided with
 special status bits to make sure the information isn't rewritten by another
 peer. Doorbell registers provide a way for peers to send interrupt events.
 Memory windows allow translated read and write access to the peer memory.