Document some gnoland flags require -lazy

[grepsuzette]

Description

Initially thought it was #2391 but it's a bit different.

When you initialize a new chain manually with gnoland, without -lazy, -genesis-balances-file and -genesis-txs-file are then totally ignored.
Yet the -help doesn't mention this.

Diagnostic

In https://github.com/gnolang/gno/blob/f74e5f0554d1604c94f9dcad5b126c55f1e52ff1/gno.land/cmd/gnoland/start.go

genesisBalancesFile is only used here:

func generateGenesisFile(genesisFile string, pk crypto.PubKey, c *startCfg) error {
	gen := &bft.GenesisDoc{}
	gen.GenesisTime = time.Now()
	gen.ChainID = c.chainID
	(...)

	// Load balances files
	balances, err := gnoland.LoadGenesisBalancesFile(c.genesisBalancesFile)  // HERE
	if err != nil {
		return fmt.Errorf("unable to load genesis balances file %q: %w", c.genesisBalancesFile, err)  // HERE
	}

And generateGenesisFile only ever gets called here:

// lazyInitGenesis a new genesis.json file, with a signle validator
func lazyInitGenesis(...) error {
	// Check if the genesis.json is present
	if osm.FileExists(genesisPath) {
		return nil
	}

	// Generate the new genesis.json file
	if err := generateGenesisFile(genesisPath, publicKey, c); err != nil {  // CALLED HERE

We must better document -genesis-balances-file in the command, and probably fail when this option is called without -lazy.

Same observation for -genesis-txs-file