Fixing typo in help message
Fixing typo in help message

brianlmoon/GearmanManager,yonglehou/GearmanManager,yonglehou/GearmanManager,hhy5861/GearmanManager,hechunwen/GearmanManager,hhy5861/GearmanManager,productsupcom/GearmanManager,hechunwen/GearmanManager,productsupcom/GearmanManager,lvbaosong/GearmanManager