docs: i2c: smbus-protocol: improve DataLow/DataHigh definition

Use a more professional wording.
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

Documentation/i2c/smbus-protocol.rst

@@ -45,8 +45,8 @@ Addr  (7 bits)  I2C 7 bit address. Note that this can be expanded to
                 get a 10 bit I2C address.
 Comm  (8 bits)  Command byte, a data byte which often selects a register on
                 the device.
-Data  (8 bits)  A plain data byte. Sometimes, I write DataLow, DataHigh
-                for 16 bit data.
+Data  (8 bits)  A plain data byte. DataLow and DataHigh represent the low and
+                high byte of a 16 bit word.
 Count (8 bits)  A data byte containing the length of a block operation.
 
 [..]            Data sent by I2C device, as opposed to data sent by the host