cmd: pwm: fix typo 'eisable' -> 'disable'

Fixed misspelled 'disable' in help text.

Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
diff --git a/cmd/pwm.c b/cmd/pwm.c
index 7947e61..7e82955 100644
--- a/cmd/pwm.c
+++ b/cmd/pwm.c
@@ -111,5 +111,5 @@
 	   "invert <pwm_dev_num> <channel> <polarity> - invert polarity\n"
 	   "pwm config <pwm_dev_num> <channel> <period_ns> <duty_ns> - config PWM\n"
 	   "pwm enable <pwm_dev_num> <channel> - enable PWM output\n"
-	   "pwm disable <pwm_dev_num> <channel> - eisable PWM output\n"
+	   "pwm disable <pwm_dev_num> <channel> - disable PWM output\n"
 	   "Note: All input values are in decimal");