docs: fix stale Ignition checkout example in README

[ming1523]

Summary

• fix the stale git checkout example in the Ignition node instructions
• align the example with the current Fuel Ignition version table in the README
• fix the section title grammar while touching the same block

Validation

• verified the README now points to v0.47.1, which matches the Fuel Ignition version listed in the table above

This is a docs-only change. The no changelog label seems appropriate if maintainers agree.

[fuel-cla-bot]

Thanks for the contribution! Before we can merge this, we need @ming1523 to sign the Fuel Labs Contributor License Agreement.

[cursor]

PR Summary

Low Risk
Docs-only edits update the Ignition node instructions; no runtime/code-path changes and minimal risk beyond potential reader confusion if incorrect.

Overview
Updates the README’s Ignition node setup instructions by fixing the section title grammar and replacing the stale git checkout example with v0.47.1, aligning it with the current Fuel Ignition version listed in the README table.

^{Written by Cursor Bugbot for commit c90ec7b. This will update automatically on new commits. Configure here.}

[xgreenx]

Thank you for your PR. You are right that we need to actualzie readme in many palces, so instead of many small PRs, we will just have one with all actualization