refactor(experimental): fix transaction references in signers documentation

[lorisleiva]

Some of the functions and examples in the signers documentation (and some comments in the tests) hadn't been updating since the transaction to transactionMessage refactoring.

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Latest commit: 550388d4083045f62846ae1536200464cd2f42f1

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[lorisleiva]

• #2853 👈
• #2852
• master

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Merge activity

• Jun 26, 5:05 AM EDT: @lorisleiva started a stack merge that includes this pull request via Graphite.
• Jun 26, 5:08 AM EDT: Graphite rebased this pull request as part of a merge.
• Jun 26, 5:09 AM EDT: @lorisleiva merged this pull request with Graphite.