docs: update hrp cmd docs

cmd/pytest.go

@@ -13,7 +13,7 @@ import (
 	"github.com/httprunner/httprunner/v5/internal/sdk"
 )
 
-var pytestCmd = &cobra.Command{
+var CmdPytest = &cobra.Command{
 	Use:                "pytest $path ...",
 	Short:              "run API test with pytest",
 	Args:               cobra.MinimumNArgs(1),
@@ -38,10 +38,6 @@ var pytestCmd = &cobra.Command{
 	},
 }
 
-func init() {
-	rootCmd.AddCommand(pytestCmd)
-}
-
 func runPytest(args []string) error {
 	args = append([]string{"run"}, args...)
 	return myexec.ExecPython3Command("httprunner", args...)