i2c: Fix typo in SMBus Write Word Data description

Write data, don't read it.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

Documentation/i2c/smbus-protocol

@@ -97,7 +97,7 @@ SMBus Write Word Data
 =====================
 
 This is the opposite operation of the Read Word Data command. 16 bits
-of data is read from a device, from a designated register that is 
+of data is written to a device, to the designated register that is
 specified through the Comm byte. 
 
 S Addr Wr [A] Comm [A] DataLow [A] DataHigh [A] P