Kconfig: Typo: seti -> set

Also, I introduced some punctuation to facilitate reading.
Signed-off-by: Michael Witten <mfwitten@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

init/Kconfig

@@ -743,8 +743,8 @@ config BLK_CGROUP
 
 	This option only enables generic Block IO controller infrastructure.
 	One needs to also enable actual IO controlling logic/policy. For
-	enabling proportional weight division of disk bandwidth in CFQ seti
-	CONFIG_CFQ_GROUP_IOSCHED=y and for enabling throttling policy set
+	enabling proportional weight division of disk bandwidth in CFQ, set
+	CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set
 	CONFIG_BLK_THROTTLE=y.
 
 	See Documentation/cgroups/blkio-controller.txt for more information.