docs: 增加ohos不支持平衡音配置说明 · Pull Request !5 · OpenHarmony-SIG/flutter_audioplayers

# Description

## Checklist

- [ ] The title of my PR starts with a [Conventional Commit] prefix (`fix:`, `feat:`, `docs:`, `chore:` etc).
- [ ] I have read the [Contributor Guide] and followed the process outlined for submitting PRs.
- [ ] I have updated/added tests for ALL new/updated/fixed functionality.
- [ ] I have updated/added relevant documentation and added dartdoc comments with `///`, where necessary.
- [ ] I have updated/added relevant examples in [example].

## Breaking Change

<!-- Does your PR require audioplayers users to manually update their apps to accommodate your change?

If the PR is a breaking change this should be indicated with suffix "!" 
(for example, `feat!:`, `fix!:`). See [Conventional Commit] for details.
-->

- [ ] Yes, this is a breaking change.
- [ ] No, this is *not* a breaking change.

<!-- ### Migration instructions

Before:
```
```

After:
```
```

If the PR is breaking, uncomment this header and add instructions for how to migrate from the
currently released version to the new proposed way.
-->

## Related Issues

[issue database]: https://github.com/bluefireteam/audioplayers/issues
[Contributor Guide]: https://github.com/bluefireteam/audioplayers/blob/main/contributing.md#feature-requests--prs
[Conventional Commit]: https://conventionalcommits.org
[example]: https://github.com/bluefireteam/audioplayers/tree/main/packages/audioplayers/example
docs: #IALHLA

类型	指派人员	状态
审查	zjzhu 已审查通过 aibin 已审查通过 lihui 已审查通过	已完成 (3/1人)
测试	openharmony_ci 已测试通过	已完成 (1/1人)

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