Fix typo in newly added documentation.

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Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20200717' into staging

Fix typo in newly added documentation.

# gpg: Signature made Fri 17 Jul 2020 14:54:20 BST
# gpg:                using RSA key C3D0D66DC3624FF6A8C018CEDECF6B93C6F02FAF
# gpg:                issuer "cohuck@redhat.com"
# gpg: Good signature from "Cornelia Huck <conny@cornelia-huck.de>" [marginal]
# gpg:                 aka "Cornelia Huck <huckc@linux.vnet.ibm.com>" [full]
# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>" [full]
# gpg:                 aka "Cornelia Huck <cohuck@kernel.org>" [marginal]
# gpg:                 aka "Cornelia Huck <cohuck@redhat.com>" [marginal]
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck/tags/s390x-20200717:
  docs/s390x: fix vfio-ccw type

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

docs/system/s390x/vfio-ccw.rst

@@ -29,7 +29,7 @@ automatically, use
 
    [root@host ~]# driverctl -b css set-override 0.0.0313 vfio_ccw
    [root@host ~]# mdevctl define -u 7e270a25-e163-4922-af60-757fc8ed48c6 \
-                  -p 0.0.0313 -t vfio-ccw_io -a
+                  -p 0.0.0313 -t vfio_ccw-io -a
 
 If using ``mdevctl`` is not possible or wanted, follow the manual procedure
 below.