Update the short description to match the text on the GitHub project

https://github.com/containers/toolbox/pull/814

doc/toolbox.1.md

@@ -1,7 +1,7 @@
 % toolbox(1)
 
 ## NAME
-toolbox - Unprivileged development environment
+toolbox - Tool for containerized command line environments on Linux
 
 ## SYNOPSIS
 **toolbox** [*--assumeyes* | *-y*]

src/cmd/root.go

@@ -45,7 +45,7 @@ var (
 
 	rootCmd = &cobra.Command{
 		Use:               "toolbox",
-		Short:             "Unprivileged development environment",
+		Short:             "Tool for containerized command line environments on Linux",
 		PersistentPreRunE: preRun,
 		RunE:              rootRun,
 		Version:           version.GetVersion(),

test/system/002-help.bats

@@ -16,14 +16,14 @@ load 'libs/helpers.bash'
   run $TOOLBOX help
 
   assert_success
-  assert_output --partial "toolbox - Unprivileged development environment"
+  assert_output --partial "toolbox - Tool for containerized command line environments on Linux"
 }
 
 @test "help: Use flag '--help' (it should show usage screen)" {
   run $TOOLBOX --help
 
   assert_success
-  assert_output --partial "toolbox - Unprivileged development environment"
+  assert_output --partial "toolbox - Tool for containerized command line environments on Linux"
 }
 
 @test "help: Try to run toolbox with non-existent command (shows usage screen)" {