docs: volumes pruning docs - more warnings

cli/server/prune.go

@@ -23,16 +23,21 @@ var volunesFilter bool
 
 var volumesFilterFlag = &cli.BoolFlag{
 	Name:        "volumes, v",
-	Usage:       "Prune volumes",
+	Usage:       "Prune volumes. This will remove app data, Be Careful!",
 	Destination: &volunesFilter,
 }
 
 var serverPruneCommand = cli.Command{
-	Name:        "prune",
-	Aliases:     []string{"p"},
-	Usage:       "Prune a managed server; Runs a docker system prune",
-	Description: "Prunes unused containers, networks, and dangling images",
-	ArgsUsage:   "[<server>]",
+	Name:    "prune",
+	Aliases: []string{"p"},
+	Usage:   "Prune a managed server; Runs a docker system prune",
+	Description: `
+Prunes unused containers, networks, and dangling images.
+
+If passing "-v/--volumes" then volumes not connected with a deployed app will
+also be removed. This can result in unwanted data loss if not used carefully.
+	`,
+	ArgsUsage: "[<server>]",
 	Flags: []cli.Flag{
 		allFilterFlag,
 		volumesFilterFlag,