docs: further server docs [ci skip]

cli/server/add.go

@@ -42,7 +42,7 @@ var provisionFlag = &cli.BoolFlag{
 
 var traefik bool
 var traefikFlag = &cli.BoolFlag{
-	Name:        "traefi",
+	Name:        "traefik",
 	Aliases:     []string{"t"},
 	Value:       false,
 	Usage:       "Deploy traefik",
@@ -242,7 +242,7 @@ func deployTraefik(c *cli.Context, cl *dockerClient.Client, domainName string) e
 
 var serverAddCommand = &cli.Command{
 	Name:  "add",
-	Usage: "Add a server to your Abra configuration",
+	Usage: "Add a server to your configuration",
 	Description: `
 This command adds a new server to your configuration so that it can be managed
 by Abra.