add long description to root command

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

commands/root.go

@@ -12,7 +12,8 @@ import (
 
 func NewRootCmd(name string, isPlugin bool, dockerCli command.Cli) *cobra.Command {
 	cmd := &cobra.Command{
-		Short: "Build with BuildKit",
+		Short: "Docker Buildx",
+		Long:  `Extended build capabilities with BuildKit`,
 		Use:   name,
 	}
 	if isPlugin {

docs/reference/buildx.md

@@ -5,7 +5,7 @@ docker buildx [OPTIONS] COMMAND
 ```
 
 <!---MARKER_GEN_START-->
-Build with BuildKit
+Extended build capabilities with BuildKit
 
 ### Subcommands