i2c: make kerneldoc about bus recovery more precise

"Used internally" is vague. What it actually means is that those fields
are populated by the core if valid GPIOs are provided. Change the
comments to reflect that.
Tested-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

include/linux/i2c.h

@@ -545,12 +545,12 @@ struct i2c_timings {
  * @recover_bus: Recover routine. Either pass driver's recover_bus() routine, or
  *	i2c_generic_scl_recovery().
  * @get_scl: This gets current value of SCL line. Mandatory for generic SCL
- *      recovery. Used internally for generic GPIO recovery.
- * @set_scl: This sets/clears SCL line. Mandatory for generic SCL recovery. Used
- *      internally for generic GPIO recovery.
+ *      recovery. Populated internally for generic GPIO recovery.
+ * @set_scl: This sets/clears the SCL line. Mandatory for generic SCL recovery.
+ *      Populated internally for generic GPIO recovery.
  * @get_sda: This gets current value of SDA line. Optional for generic SCL
- *      recovery. Used internally, if sda_gpio is a valid GPIO, for generic GPIO
- *      recovery.
+ *      recovery. Populated internally, if sda_gpio is a valid GPIO, for generic
+ *      GPIO recovery.
  * @prepare_recovery: This will be called before starting recovery. Platform may
  *	configure padmux here for SDA/SCL line or something else they want.
  * @unprepare_recovery: This will be called after completing recovery. Platform