Update main.sw

[the-first-elder]

 fn get_msg_asset_id() {
        // ANCHOR: msg_asset_id
       - let amount = msg_asset_id();
       +  let native_asset_id = msg_asset_id();
        // ANCHOR_END: msg_asset_id
    }

Description

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
  • If my change requires substantial documentation changes, I have requested support from the DevRel team
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• [X ] I have requested a review from the relevant team or maintainers.

[fuel-cla-bot]

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