Add missing references

docs/references/tablesdb/create-operations.md

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+Create multiple operations in a single transaction.

docs/references/tablesdb/create-transaction.md

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+Create a new transaction.

docs/references/tablesdb/delete-transaction.md

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+Delete a transaction by its unique ID.

docs/references/tablesdb/get-transaction.md

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+Get a transaction by its unique ID.

docs/references/tablesdb/list-transactions.md

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+List transactions across all databases.

docs/references/tablesdb/update-transaction.md

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+Update a transaction, to either commit or roll back its operations.