i2c: rephrase explanation of I2C_CLASS_DEPRECATED

Hopefully making clear that it is not needed for new drivers.
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

include/linux/i2c.h

@@ -689,7 +689,8 @@ i2c_unlock_adapter(struct i2c_adapter *adapter)
 #define I2C_CLASS_HWMON		(1<<0)	/* lm_sensors, ... */
 #define I2C_CLASS_DDC		(1<<3)	/* DDC bus on graphics adapters */
 #define I2C_CLASS_SPD		(1<<7)	/* Memory modules */
-#define I2C_CLASS_DEPRECATED	(1<<8)	/* Warn users that adapter will stop using classes */
+/* Warn users that the adapter doesn't support classes anymore */
+#define I2C_CLASS_DEPRECATED	(1<<8)
 
 /* Internal numbers to terminate lists */
 #define I2C_CLIENT_END		0xfffeU