Clarify TxConfig initialization in golang-client-tutorial.md

[thearcyx]

Overview

This PR improves the documentation of the NewTxConfig function in golang-client-tutorial.md.

The updated comment explains that NewTxConfig() initializes a transaction configuration with default gas settings (DefaultGasPrice, DefaultMaxGasPrice) and that it can optionally take variadic options to customize its behavior.

This change is important because passing nil as the TxConfig can lead to runtime errors. For example, when calling client.Blob.Submit(ctx, []*blob.Blob{...}, nil), although nil is accepted by the function signature, it may cause internal panics due to uninitialized fields in the transaction context. Using a default TxConfig avoids this and ensures stability.

Context

While following the Go client tutorial, I encountered a runtime error when submitting a blob using nil for the SubmitOptions. This was resolved by explicitly initializing a TxConfig using state.NewTxConfig(). This PR updates the guide to help future developers avoid the same pitfall.

Checklist

• [x] Clear and safe example added for TxConfig usage
• [x] Based on a reproducible runtime issue
• [x] Aligned with Celestia's contributor guide
• [x] No breaking changes introduced

Summary by CodeRabbit

• Documentation
  • Updated the Golang client tutorial to use a default transaction configuration for blob submission, ensuring safer default settings.
  • Added comments to clarify the use of a default transaction configuration.

[coderabbitai[bot]]

Walkthrough

The Golang client tutorial was updated to use a default transaction configuration object when submitting a blob, replacing the previous use of nil. The import section now includes the state package, and comments were added to explain the rationale behind this change. No changes were made to control flow or error handling.

Changes

File(s)	Change Summary
tutorials/golang-client-tutorial.md	Updated blob submission example to use state.NewTxConfig() instead of nil; added explanatory comments; imported state package.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant GolangClientTutorial
    participant CelestiaClient
    participant State

    User->>GolangClientTutorial: Call SubmitBlob()
    GolangClientTutorial->>State: Create TxConfig (NewTxConfig)
    GolangClientTutorial->>CelestiaClient: Submit(blob, namespace, TxConfig)
    CelestiaClient-->>GolangClientTutorial: Return result/error
    GolangClientTutorial-->>User: Return result/error

Possibly related PRs

• celestiaorg/docs#1671: Modifies the Golang client tutorial to improve blob submission by introducing configurable transaction options.
• celestiaorg/docs#2011: Updates the tutorial to use state.NewTxConfig() instead of nil for blob submission options.

Suggested reviewers

• jcstein

Poem

A nibble of code, a hop and a bound,
With TxConfig in tow, safe defaults are found.
No more nils wandering in the night,
State imported, the future is bright!
🐰✨

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[jcstein]

let's also update the CI/CD that was added in https://github.com/celestiaorg/docs/pull/2069 for this