docs: add minimum versions to the command pages

cmd/ls/ls.go

@@ -31,6 +31,9 @@ Eg
         37600 fubuwic
 
 ` + lshelp.Help,
+	Annotations: map[string]string{
+		"versionIntroduced": "v0.90",
+	},
 	Run: func(command *cobra.Command, args []string) {
 		cmd.CheckArgs(1, 1, command, args)
 		fsrc := cmd.NewFsSrc(args)