docs: adjust helptext for the output option (#72)

Author: xoxys

_docs/_index.md

@@ -140,10 +140,10 @@ pull_image
 : enforces to pull base image at build time (default `true`)
 
 compress
-: enables compression og the build context using gzip
+: enables compression of the build context using gzip
 
 output
-: sets output folder for build artifacts (format: `path` or `type=TYPE[,KEY=VALUE]`)
+: sets the [export action](https://docs.docker.com/engine/reference/commandline/buildx_build/#output) for the build result (format: `path` or `type=TYPE[,KEY=VALUE]`)
 
 repo
 : sets repository name for the image

cmd/drone-docker-buildx/config.go

@@ -153,7 +153,7 @@ func settingsFlags(settings *plugin.Settings) []cli.Flag {
 		&cli.StringFlag{
 			Name:        "output",
 			EnvVars:     []string{"PLUGIN_OUTPUT"},
-			Usage:       "sets build output folder",
+			Usage:       "sets the export action for the build result",
 			Destination: &settings.Build.Output,
 		},
 		&cli.StringFlag{
@@ -178,7 +178,7 @@ func settingsFlags(settings *plugin.Settings) []cli.Flag {
 		&cli.BoolFlag{
 			Name:        "compress",
 			EnvVars:     []string{"PLUGIN_COMPRESS"},
-			Usage:       "enables compression og the build context using gzip",
+			Usage:       "enables compression of the build context using gzip",
 			Destination: &settings.Build.Compress,
 		},
 		&cli.StringFlag{