[docs/swhkd(1)] Fix incorrect version flag

* `-v` is incorrect :)

Signed-off-by: Shinyzenith <aakashsensharma@gmail.com>

Author: Shinyzenith

docs/swhkd.1.scd

@@ -25,7 +25,7 @@ More about the config file syntax in `swhkd(5)`
 *-h*, *--help*
 	Print help message and quit.
 
-*-v*, *--version*
+*-V*, *--version*
 	Print version information.
 
 *-c*, *--config* <CONFIG_FILE_PATH>