block: bdev & blktrace: use consistent function doc. notation

Use only one hyphen in kernel-doc notation between the function name
and its short description.

The is the documented kerenl-doc format. It also fixes the HTML
presentation to be consistent with other functions.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org
Link: https://lore.kernel.org/r/20221201070331.25685-1-rdunlap@infradead.orgSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/bdev.c

@@ -224,7 +224,7 @@ int fsync_bdev(struct block_device *bdev)
 EXPORT_SYMBOL(fsync_bdev);
 
 /**
- * freeze_bdev  --  lock a filesystem and force it into a consistent state
+ * freeze_bdev - lock a filesystem and force it into a consistent state
  * @bdev:	blockdevice to lock
  *
  * If a superblock is found on this device, we take the s_umount semaphore
@@ -268,7 +268,7 @@ int freeze_bdev(struct block_device *bdev)
 EXPORT_SYMBOL(freeze_bdev);
 
 /**
- * thaw_bdev  -- unlock filesystem
+ * thaw_bdev - unlock filesystem
  * @bdev:	blockdevice to unlock
  *
  * Unlocks the filesystem and marks it writeable again after freeze_bdev().

kernel/trace/blktrace.c

@@ -721,7 +721,7 @@ EXPORT_SYMBOL_GPL(blk_trace_startstop);
  */
 
 /**
- * blk_trace_ioctl: - handle the ioctls associated with tracing
+ * blk_trace_ioctl - handle the ioctls associated with tracing
  * @bdev:	the block device
  * @cmd:	the ioctl cmd
  * @arg:	the argument data, if any
@@ -769,7 +769,7 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
 }
 
 /**
- * blk_trace_shutdown: - stop and cleanup trace structures
+ * blk_trace_shutdown - stop and cleanup trace structures
  * @q:    the request queue associated with the device
  *
  **/