Fixed typos and language for clarity for Transactional mirroring.md

[jimmymcnutty]

Closes #(Insert issue number closed by this PR)

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[github-actions[bot]]

:recycle: PR Preview ff198c6b4aac58addc8932f15c11328c752a6107 has been successfully destroyed since this PR has been closed.

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[github-actions[bot]]

E2E Test Results - Quickstart

[github-actions[bot]]

E2E Test Results - DynamoDB Local - Local Block Adapter

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@jimmymcnutty Please reopen if relevant