treewide: Fix typo in Documentation/DocBook/device-drivers

This patch fix speeling typo found in html files within
Documentation/DocBook/device-drivers.
It is because html files are generated from comments in source,
so I have to fix comments in the source.

Signed-off-by: Masanari Iida <[e-mail]>
Acked-by: Randy Dunlap <[e-mail]>
Acked-by: Wolfram Sang <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>

drivers/dma-buf/fence.c

···
  * @cb:		[in]	the callback to remove
  *
  * Remove a previously queued callback from the fence. This function returns
- * true if the callback is succesfully removed, or false if the fence has
+ * true if the callback is successfully removed, or false if the fence has
  * already been signaled.
  *
  * *WARNING*:

include/linux/fence.h

···
  * from irq context, so normal spinlocks can be used.
  *
  * A return value of false indicates the fence already passed,
- * or some failure occured that made it impossible to enable
- * signaling. True indicates succesful enabling.
+ * or some failure occurred that made it impossible to enable
+ * signaling. True indicates successful enabling.
  *
  * fence->status may be set in enable_signaling, but only when false is
  * returned.

include/linux/i2c.h

···
  * to name two of the most common.
  *
  * The return codes from the @master_xfer field should indicate the type of
- * error code that occured during the transfer, as documented in the kernel
+ * error code that occurred during the transfer, as documented in the kernel
  * Documentation file Documentation/i2c/fault-codes.
  */
 struct i2c_algorithm {