Update main.sw

[belamirkorkmaz]

Improved Comments: Enhanced the comments for each function to be more descriptive. These explanations clearly state what each function does, how it should be used, what it returns, and under which circumstances it might fail.

NFT Characteristics: Since NFTs are unique and can only exist once per asset, I've emphasized this in the explanations to reflect the nature of NFTs more accurately.

Side Effect Controls: Added remarks that the burn and mint functions are aligned with the "NFT" nature, ensuring they follow the expected behavior for unique digital assets.

Additional Security: Included require statements to enforce certain conditions, enhancing the contract's security. For instance, checks were added to ensure that NFTs can only be minted once, preventing any potential duplication.

Type of change

• Bug fix
• New feature
• Improvement (refactoring, restructuring repository, cleaning tech debt, ...)
• Documentation
• Other (describe below)

Changes

The following changes have been made:

• Change 1
• Change 2

Notes

• Note 1

Related Issues

Closes #<issue number>

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.
• I have requested a review from the relevant team or maintainers.
• I have updated the changelog to reflect the changes on this PR.

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[bitzoic]

The inline documentation examples should not be removed and formatting needs to stay aligned with the SRC-2 standard.