docs: hwmon: sysfs-interface: Fix stray colon

The commit 036d6a4 ("ABI: sysfs-class-hwmon: add ABI documentation
for it") moved all ABI attributes to the usual ABI documentation. But this
change left a stray colon for the fan speed control method. Fix this
to avoid a confusion of readers.

Fixes: 036d6a4 ("ABI: sysfs-class-hwmon: add ABI documentation for it")
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/20230312155714.17290-1-stefan.wahren@i2se.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/sysfs-interface.rst

@@ -201,7 +201,7 @@ PWM
 		Pulse width modulation fan control.
 
 `pwm[1-*]_enable`
-		Fan speed control method:
+		Fan speed control method.
 
 `pwm[1-*]_mode`
 		direct current or pulse-width modulation.