Fix spelling mistake

(cherry picked from commit a68780a)

Author: deliahu

cli/cmd/get.go

@@ -59,7 +59,7 @@ var getCmd = &cobra.Command{
 	Use:   "get [API_NAME]",
 	Short: "get information about APIs",
 	Long: `This command displays information about APIs.
-Adding the -v or --verbose flag displays additonal information.`,
+Adding the -v or --verbose flag displays additional information.`,
 	Args: cobra.RangeArgs(0, 1),
 	Run: func(cmd *cobra.Command, args []string) {
 		rerun(func() (string, error) {