Fix the max-concurrent-downloads and max-concurrent-uploads configs documentation

This fix tries to address issues raised in #44346.
The max-concurrent-downloads and max-concurrent-uploads limits are applied for the whole engine and not for each pull/push command.

Signed-off-by: Luis Henrique Mulinari <luis.mulinari@gmail.com>
(cherry picked from commit 6c0aa5b00a8c1e9e2d2313bfa355f18525bee880)
Signed-off-by: Cory Snider <csnider@mirantis.com>

cmd/dockerd/config.go

@@ -59,8 +59,8 @@ func installCommonConfigFlags(conf *config.Config, flags *pflag.FlagSet) error {
 	flags.Var(opts.NewNamedMapOpts("log-opts", conf.LogConfig.Config, nil), "log-opt", "Default log driver options for containers")
 
 	flags.StringVar(&conf.CorsHeaders, "api-cors-header", "", "Set CORS headers in the Engine API")
-	flags.IntVar(&conf.MaxConcurrentDownloads, "max-concurrent-downloads", conf.MaxConcurrentDownloads, "Set the max concurrent downloads for each pull")
-	flags.IntVar(&conf.MaxConcurrentUploads, "max-concurrent-uploads", conf.MaxConcurrentUploads, "Set the max concurrent uploads for each push")
+	flags.IntVar(&conf.MaxConcurrentDownloads, "max-concurrent-downloads", conf.MaxConcurrentDownloads, "Set the max concurrent downloads")
+	flags.IntVar(&conf.MaxConcurrentUploads, "max-concurrent-uploads", conf.MaxConcurrentUploads, "Set the max concurrent uploads")
 	flags.IntVar(&conf.MaxDownloadAttempts, "max-download-attempts", conf.MaxDownloadAttempts, "Set the max download attempts for each pull")
 	flags.IntVar(&conf.ShutdownTimeout, "shutdown-timeout", conf.ShutdownTimeout, "Set the default shutdown timeout")