add gas limit info to docs

[1xstj]

Summary of changes

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-

Proposed area of change

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• [ ] Overview
• [ ] Anchor System
• [ ] dApps
• [ ] Tangle
• [ ] Protocols
• [ ] Relayers

Reference issue to close (if applicable)

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• Closes

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Code Checklist

• [ ] I have tested that prove my changes are working as intended
• [ ] I have added necessary documentation (if appropriate)

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