caddycmd: fix caddy validate/fmt help message (#4377)

* caddycmd: fix caddy validate help message

Fixes #4376

* caddycmd: fix caddy fmt help message

cmd/commands.go

@@ -259,7 +259,7 @@ Loads and provisions the provided config, but does not start running it.
 This reveals any errors with the configuration through the loading and
 provisioning stages.`,
 		Flags: func() *flag.FlagSet {
-			fs := flag.NewFlagSet("load", flag.ExitOnError)
+			fs := flag.NewFlagSet("validate", flag.ExitOnError)
 			fs.String("config", "", "Input configuration file")
 			fs.String("adapter", "", "Name of config adapter")
 			return fs
@@ -282,7 +282,7 @@ If you wish you use stdin instead of a regular file, use - as the path.
 When reading from stdin, the --overwrite flag has no effect: the result
 is always printed to stdout.`,
 		Flags: func() *flag.FlagSet {
-			fs := flag.NewFlagSet("format", flag.ExitOnError)
+			fs := flag.NewFlagSet("fmt", flag.ExitOnError)
 			fs.Bool("overwrite", false, "Overwrite the input file with the results")
 			return fs
 		}(),