fix: docs

[edu-stx]

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Description

Updates the docs to use a BigInt for amount and fixes the the txId property name.

Type of Change

• [ ] New feature
• [ ] Bug fix
• [x] API reference/documentation update
• [ ] Other

Checklist

• [x] Code is commented where needed
• [x] Unit test coverage for new or modified code paths
• [x] yarn lerna run test passes
• [ ] Changelog is updated
• [x] Tag 1 of @hstove or @kyranjamie or @aulneau for review

cc @kyranjamie

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Latest commit: 86a6bdcccaa67e230c2e3e4d52ffbdd0cf80b685

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Name	Status	Preview	Updated
connect-docs	✅ Ready (Inspect)	Visit Preview	Jan 3, 2023 at 7:55PM (UTC)

[edu-stx]

Is this PR still useful? Will close if not.