Add `async_setup` to DataUpdateCoordinator documentation

[zweckj]

Proposed change

Type of change

• [ ] Document existing features within Home Assistant
• [x] Document new or changing features which there is an existing pull request elsewhere
• [ ] Spelling or grammatical corrections, or rewording for improved clarity
• [ ] Changes to the backend of this documentation
• [ ] Removed stale or deprecated documentation

Additional information

• This PR fixes or closes issue: fixes #
• Link to relevant existing code or pull request: https://github.com/home-assistant/core/pull/116677#pullrequestreview-2188063936

Summary by CodeRabbit

• New Features

  • Introduced a new asynchronous method for initializing the data coordinator, enhancing the efficiency of data loading from the API.

• Documentation

  • Updated documentation to include details about the new method and its purpose within the data update process.

[coderabbitai[bot]]

Walkthrough

## Walkthrough The recent changes introduce a new asynchronous method, `_async_setup`, to the `MyCoordinator` class within the `DataUpdateCoordinator` framework. This method initializes the coordinator and pre-loads essential data from an API during the initial configuration, enhancing the coordinator's functionality and efficiency by ensuring that necessary data is available before updates occur. ## Changes | File | Change Summary | |-------------------------------------|----------------------------------------------------------------| | `docs/integration_fetching_data.md` | Added a new asynchronous method `_async_setup` in `MyCoordinator` for initial API data loading. | ## Sequence Diagram(s) ```mermaid sequenceDiagram participant User participant MyCoordinator participant API User->>MyCoordinator: Trigger first refresh MyCoordinator->>MyCoordinator: _async_setup() MyCoordinator->>API: Fetch initial data API-->>MyCoordinator: Return data MyCoordinator->>User: Data ready for use ```

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Recent review details

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Commits

Files that changed from the base of the PR and between 9a596318a57e9845a6080a2851c94002c236c2d3 and 3d762e09bf126e52e9eb8df6f8dd10575716657f.

Files selected for processing (1)

* docs/integration_fetching_data.md (1 hunks)

Files skipped from review as they are similar to previous changes (1)

* docs/integration_fetching_data.md

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