s390/cmf: fix kerneldoc

Make sure we use proper Return sections, and make the output
for cmf_enable() less odd.

Signed-off-by: Cornelia Huck <cohuck@redhat.com>
diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c
index 5e495c6..6e4f50d 100644
--- a/drivers/s390/cio/cmf.c
+++ b/drivers/s390/cio/cmf.c
@@ -1118,9 +1118,10 @@
  * enable_cmf() - switch on the channel measurement for a specific device
  *  @cdev:	The ccw device to be enabled
  *
- *  Returns %0 for success or a negative error value.
- *  Note: If this is called on a device for which channel measurement is already
- *	  enabled a reset of the measurement data is triggered.
+ *  Enable channel measurements for @cdev. If this is called on a device
+ *  for which channel measurement is already enabled a reset of the
+ *  measurement data is triggered.
+ *  Returns: %0 for success or a negative error value
  *  Context:
  *    non-atomic
  */
@@ -1160,7 +1161,7 @@
  * __disable_cmf() - switch off the channel measurement for a specific device
  *  @cdev:	The ccw device to be disabled
  *
- *  Returns %0 for success or a negative error value.
+ *  Returns: %0 for success or a negative error value.
  *
  *  Context:
  *    non-atomic, device_lock() held.
@@ -1184,7 +1185,7 @@
  * disable_cmf() - switch off the channel measurement for a specific device
  *  @cdev:	The ccw device to be disabled
  *
- *  Returns %0 for success or a negative error value.
+ *  Returns: %0 for success or a negative error value.
  *
  *  Context:
  *    non-atomic
@@ -1205,7 +1206,7 @@
  * @cdev:	the channel to be read
  * @index:	the index of the value to be read
  *
- * Returns the value read or %0 if the value cannot be read.
+ * Returns: The value read or %0 if the value cannot be read.
  *
  *  Context:
  *    any
@@ -1220,7 +1221,7 @@
  * @cdev:	the channel to be read
  * @data:	a pointer to a data block that will be filled
  *
- * Returns %0 on success, a negative error value otherwise.
+ * Returns: %0 on success, a negative error value otherwise.
  *
  *  Context:
  *    any