UIO: add UIO documentation target to DocBook Makefile

Add the DocBook documentation for the Userspace I/O framework
to the Makefile.

Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Signed-off-by: Hans J Koch <hjk@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>


diff --git a/Documentation/DocBook/Makefile b/Documentation/DocBook/Makefile
index 054a7ec..4953bc2 100644
--- a/Documentation/DocBook/Makefile
+++ b/Documentation/DocBook/Makefile
@@ -11,7 +11,7 @@
 	    procfs-guide.xml writing_usb_driver.xml \
 	    kernel-api.xml filesystems.xml lsm.xml usb.xml \
 	    gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml \
-	    genericirq.xml s390-drivers.xml
+	    genericirq.xml s390-drivers.xml uio-howto.xml
 
 ###
 # The build process is as follows (targets):