i2c.h: fix kernel-doc warnings

Fix kernel-doc warnings in linux/i2c.h:

  Warning(include/linux/i2c.h:176): No description found for parameter 'alert'
  Warning(include/linux/i2c.h:259): No description found for parameter 'of_node'

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 21067b418..38dd402 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -108,6 +108,7 @@
  * @shutdown: Callback for device shutdown
  * @suspend: Callback for device suspend
  * @resume: Callback for device resume
+ * @alert: Alert callback, for example for the SMBus alert protocol
  * @command: Callback for bus-wide signaling (optional)
  * @driver: Device driver model driver
  * @id_table: List of I2C devices supported by this driver
@@ -233,6 +234,7 @@
  * @addr: stored in i2c_client.addr
  * @platform_data: stored in i2c_client.dev.platform_data
  * @archdata: copied into i2c_client.dev.archdata
+ * @of_node: pointer to OpenFirmware device node
  * @irq: stored in i2c_client.irq
  *
  * I2C doesn't actually support hardware probing, although controllers and