clarify rollup CGT requirements

[0xallan]

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Please fill out the below to ensure your doc gets quickly approved and merged.

Description

updating the Custom Gas Token for Rollups page to clarify requirements for CGTs and mirror the requirements on Custom Gas Token for AnyTrust page

Document type

• Gentle introduction
• Quickstart
• How-to
• Concept
• FAQ
• Troubleshooting
• Reference
• Third-party content
• Not applicable

Checklist

• I have read the CONTRIBUTE.md guidelines
• My changes follow the style conventions outlined in CONTRIBUTE.md
• I have used sentence-case for titles and headers
• I have used descriptive link text (not "here" or "this")
• I have separated procedural from conceptual content where appropriate
• I have tested my changes locally with yarn start or yarn build
• My code follows the existing code style and conventions
• I have added/updated frontmatter for new documents
• I have checked for broken links
• I have verified that my changes don't break the build
• Third-party docs only: Do you agree to the third-party content policy outlined within CONTRIBUTE.md?
  • Yes
  • Not applicable

Additional Notes

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Project	Deployment	Preview	Updated (UTC)
arbitrum-docs	Ready	Preview	Oct 15, 2025 7:44pm

[anegg0]

Thank you for contributing to our docs!

Please fill out the below to ensure your doc gets quickly approved and merged.

Description

updating the Custom Gas Token for Rollups page to clarify requirements for CGTs and mirror the requirements on Custom Gas Token for AnyTrust page

Document type

• Gentle introduction
• Quickstart
• How-to
• Concept
• FAQ
• Troubleshooting
• Reference
• Third-party content
• Not applicable

Checklist

• I have read the CONTRIBUTE.md guidelines

• My changes follow the style conventions outlined in CONTRIBUTE.md

• I have used sentence-case for titles and headers

• I have used descriptive link text (not "here" or "this")

• I have separated procedural from conceptual content where appropriate

• I have tested my changes locally with yarn start or yarn build

• My code follows the existing code style and conventions

• I have added/updated frontmatter for new documents

• I have checked for broken links

• I have verified that my changes don't break the build

• Third-party docs only: Do you agree to the third-party content policy outlined within CONTRIBUTE.md?

  • Yes
  • Not applicable

Additional Notes

You filled out the questionnaire, nice @0xallan

[anegg0]

Just a minor rephrasing. Please dismiss if it doesn't make sense.