docs: add minimum versions to the command pages

cmd/serve/dlna/dlna.go

@@ -47,6 +47,9 @@ media transcoding support. This means that some players might show
 files that they are not able to play back correctly.
 
 ` + dlnaflags.Help + vfs.Help,
+	Annotations: map[string]string{
+		"versionIntroduced": "v1.46",
+	},
 	Run: func(command *cobra.Command, args []string) {
 		cmd.CheckArgs(1, 1, command, args)
 		f := cmd.NewFsSrc(args)

cmd/serve/docker/docker.go

@@ -48,7 +48,9 @@ var Command = &cobra.Command{
 	Use:   "docker",
 	Short: `Serve any remote on docker's volume plugin API.`,
 	Long:  strings.ReplaceAll(longHelp, "|", "`") + vfs.Help,
-
+	Annotations: map[string]string{
+		"versionIntroduced": "v1.56",
+	},
 	Run: func(command *cobra.Command, args []string) {
 		cmd.CheckArgs(0, 0, command, args)
 		cmd.Run(false, false, command, func() error {

cmd/serve/ftp/ftp.go

@@ -99,6 +99,9 @@ By default this will serve files without needing a login.
 
 You can set a single username and password with the --user and --pass flags.
 ` + vfs.Help + proxy.Help,
+	Annotations: map[string]string{
+		"versionIntroduced": "v1.44",
+	},
 	Run: func(command *cobra.Command, args []string) {
 		var f fs.Fs
 		if proxyflags.Opt.AuthProxy == "" {

cmd/serve/http/http.go

@@ -60,6 +60,9 @@ The server will log errors.  Use ` + "`-v`" + ` to see access logs.
 ` + "`--bwlimit`" + ` will be respected for file transfers.  Use ` + "`--stats`" + ` to
 control the stats printing.
 ` + httplib.Help + data.Help + auth.Help + vfs.Help,
+	Annotations: map[string]string{
+		"versionIntroduced": "v1.39",
+	},
 	Run: func(command *cobra.Command, args []string) {
 		cmd.CheckArgs(1, 1, command, args)
 		f := cmd.NewFsSrc(args)

cmd/serve/restic/restic.go

@@ -128,6 +128,9 @@ these **must** end with /.  Eg
 The` + "`--private-repos`" + ` flag can be used to limit users to repositories starting
 with a path of ` + "`/<username>/`" + `.
 ` + httplib.Help,
+	Annotations: map[string]string{
+		"versionIntroduced": "v1.40",
+	},
 	Run: func(command *cobra.Command, args []string) {
 		cmd.CheckArgs(1, 1, command, args)
 		f := cmd.NewFsSrc(args)

cmd/serve/serve.go

@@ -49,6 +49,9 @@ subcommand to specify the protocol, e.g.
 
 Each subcommand has its own options which you can see in their help.
 `,
+	Annotations: map[string]string{
+		"versionIntroduced": "v1.39",
+	},
 	RunE: func(command *cobra.Command, args []string) error {
 		if len(args) == 0 {
 			return errors.New("serve requires a protocol, e.g. 'rclone serve http remote:'")

cmd/serve/sftp/sftp.go

@@ -114,6 +114,9 @@ checksumming is possible but less secure and you could use the SFTP server
 provided by OpenSSH in this case.
 
 ` + vfs.Help + proxy.Help,
+	Annotations: map[string]string{
+		"versionIntroduced": "v1.48",
+	},
 	Run: func(command *cobra.Command, args []string) {
 		var f fs.Fs
 		if proxyflags.Opt.AuthProxy == "" {

cmd/serve/webdav/webdav.go

@@ -61,6 +61,9 @@ supported hash on the backend or you can use a named hash such as
 to see the full list.
 
 ` + httplib.Help + vfs.Help + proxy.Help,
+	Annotations: map[string]string{
+		"versionIntroduced": "v1.39",
+	},
 	RunE: func(command *cobra.Command, args []string) error {
 		var f fs.Fs
 		if proxyflags.Opt.AuthProxy == "" {