doc: i2o: fix typo 'Settting'

The below patch fixes a typo "Settting" to "Setting".

Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/i2o/ioctl b/Documentation/i2o/ioctl
index 1e77fac..22ca53a 100644
--- a/Documentation/i2o/ioctl
+++ b/Documentation/i2o/ioctl
@@ -110,7 +110,7 @@
       ENOBUFS     Buffer not large enough.  If this occurs, the required
                   buffer length is written into *(lct->reslen)
 
-VI. Settting Parameters
+VI. Setting Parameters
 
    SYNOPSIS