Rpcdaemon help add namespaces (#2244)

* add namespaces list to rpcdaemon help

* add namespaces list to rpcdaemon help

* add namespaces list to rpcdaemon help

cmd/rpcdaemon/cli/config.go

@@ -75,7 +75,7 @@ func RootCommand() (*cobra.Command, *Flags) {
 	rootCmd.PersistentFlags().StringSliceVar(&cfg.HttpCORSDomain, "http.corsdomain", []string{}, "Comma separated list of domains from which to accept cross origin requests (browser enforced)")
 	rootCmd.PersistentFlags().StringSliceVar(&cfg.HttpVirtualHost, "http.vhosts", node.DefaultConfig.HTTPVirtualHosts, "Comma separated list of virtual hostnames from which to accept requests (server enforced). Accepts '*' wildcard.")
 	rootCmd.PersistentFlags().BoolVar(&cfg.HttpCompression, "http.compression", true, "Disable http compression")
-	rootCmd.PersistentFlags().StringSliceVar(&cfg.API, "http.api", []string{"eth", "erigon"}, "API's offered over the HTTP-RPC interface")
+	rootCmd.PersistentFlags().StringSliceVar(&cfg.API, "http.api", []string{"eth", "erigon"}, "API's offered over the HTTP-RPC interface: eth,erigon,web3,netdebug,trace,txpool,shh,db. Supported methods: https://github.com/ledgerwatch/erigon/tree/devel/cmd/rpcdaemon")
 	rootCmd.PersistentFlags().Uint64Var(&cfg.Gascap, "rpc.gascap", 25000000, "Sets a cap on gas that can be used in eth_call/estimateGas")
 	rootCmd.PersistentFlags().Uint64Var(&cfg.MaxTraces, "trace.maxtraces", 200, "Sets a limit on traces that can be returned in trace_filter")
 	rootCmd.PersistentFlags().BoolVar(&cfg.WebsocketEnabled, "ws", false, "Enable Websockets")