thermal/drivers/rzg2l: Fix comments

thermal/drivers/rzg2l: Fix comments

This patch replaces 'Capture times'->'Total number of ADC data samples' as
the former does not really explain much.

It also fixes the typo
 * caliberation->calibration

Lastly, as per the coding style /* should be on a separate line.
This patch fixes this issue.

Reported-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20220718121440.556408-1-biju.das.jz@bp.renesas.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>