fix the usage description to describe the option `x` the get (noack)
fix the usage description to describe the option `x` the get (noack)

zidad/EasyNetQ,micdenny/EasyNetQ,Ascendon/EasyNetQ,sanjaysingh/EasyNetQ,ar7z1/EasyNetQ,sanjaysingh/EasyNetQ,zidad/EasyNetQ,Pliner/EasyNetQ,ar7z1/EasyNetQ,maverix/EasyNetQ,tkirill/EasyNetQ,EasyNetQ/EasyNetQ,Ascendon/EasyNetQ,maverix/EasyNetQ,tkirill/EasyNetQ,Pliner/EasyNetQ