docs: celestia-node's `--node.store` flag is no longer necessary on RPC requests using default node stores

[jcstein]

https://github.com/celestiaorg/celestia-node/pull/3246

It will still be used:

1. in the cel-key utility: https://docs.celestia.org/developers/celestia-node-key#steps-for-generating-node-keys
2. for using a different directory than the standard dir: https://docs.celestia.org/nodes/celestia-node-troubleshooting#changing-the-location-of-your-node-store

[jcstein]

the node.store flag still exists, it's just not needed for rpc requests for someone using the default node store

[jcstein]

:nice:

celestia state balance
{
  "result": {
    "denom": "utia",
    "amount": "9840"
  }
}

[mastergaurang94]

p0 😲